Reference Collections of U.S. Patents and Trademarks
     Available for Public Use in Patent and Trademark Depository Libraries

The following libraries, designated as Patent and Trademark Depository
Libraries (PTDLs), receive patent and trademark information in various formats
from the U.S. Patent and Trademark Office. Many PTDLs have on file all
full-text patents issued since 1790, trademarks published since 1872, and
select collections of foreign patents. All PTDLs have both the patent and
trademark sections of the Official Gazette of the U.S. Patent and Trademark
Office. The full-text utility and design patents are distributed numerically
on 16 mm microfilm, and plant patents on color microfiche. Patent and
trademark search systems on CD-ROM (Compact Disc-Read Only) format are
available at all PTDLs to increase utilization of and enhance access to the
information found in patents and trademarks. It is through the CD-ROM systems
that preliminary patent and trademark searches can be conducted through the
numerically arranged collections.

All information is available for use by the public free of charge.

In addition, each PTDL offers reference publications which outline
and provide access to the patent and trademark classification systems, as
well as other documents and publications which supplement the basic search
tools. PTDLs provide technical staff assistance in using all materials.
Facilities for making paper copies of patent and trademark information are
generally provided for a fee.

Since there are variations in the scope of patent and trademark
collections among the PTDLs, and their hours of service to the public vary,
anyone contemplating use of these collections at a particular library is
urged to contact that library in advance about its collections, services,
and hours in order to avert possible inconvenience.

State                   Name of Library                       Telephone Contact

Alabama                 Auburn University Libraries             (205) 844-1747
                        Birmingham Public Library               (205) 226-3620
Alaska                  Anchorage: Z.J. Loussac Public Library  (907) 562-7323
Arizona                 Tempe: Noble Library, Arizona
                        State University                        (602) 965-7010
Arkansas                Little Rock: Arkansas State
                        Library                                 (501) 682-2053
California              Los Angeles Public Library              (213) 228-7220
                        Sacramento: California State Library    (916) 654-0069
                        San Diego Public Library                (619) 236-5813
                        San Francisco Public Library            (415) 557-4488
                        Sunnyvale Patent Clearinghouse          (408) 730-7290
Colorado                Denver Public Library                   (303) 640-6249
Connecticut             New Haven: Science Park Library         (203) 786-5447
Delaware                Newark: University of Delaware Library  (302) 831-2965
Dist. of Columbia       Washington: Howard University Libraries (202) 806-7252
Florida                 Fort Lauderdale: Broward County Main
                        Library                                 (305) 357-7444
                        Miami-Dade Public Library               (305) 375-2665
                        Orlando: University of Central Florida
                        Libraries                               (407) 823-2562
                        Tampa Campus Library, University
                        of South Florida                        (813) 974-2726
Georgia                 Atlanta: Price Gilbert Memorial Library,
                        Georgia Institute of Technology         (404) 894-4508
Hawaii                  Honolulu: Hawaii State Public Library
                        System                                  (808) 586-3477
Idaho                   Moscow: University of Idaho Library     (208) 885-6235
Illinois                Chicago Public Library                  (312) 747-4450
                        Springfield: Illinois State Library     (217) 782-5659
Indiana                 Indianapolis-Marion County Public
                        Library                                 (317) 269-1741
                        West Lafayette: Siegesmund Engineering
                        Library, Purdue University              (317) 494-2873
Iowa                    Des Moines: State Library of Iowa       (515) 281-4118
Kansas                  Wichita: Ablah Library, Wichita State
                        University                              (316) 689-3155
Kentucky                Louisville Free Public Library          (502) 574-1611
Louisiana               Baton Rouge: Troy H. Middleton Library,
                        Louisiana State University              (504) 388-2570
Maine                   Orono: Raymond H. Fogler Library,
                        University of Maine                     (207) 581-1678
Maryland                College Park: Engineering and Physical
                        Sciences Library, University of Maryland(301) 405-9157
Massachusetts           Amherst: Physical Sciences Library,
                        University of Massachusetts             (413) 545-1370
                        Boston Public Library                   (617) 536-5400
                                                                 Ext. 265
Michigan                Ann Arbor: Engineering Library,
                        University of Michigan                  (313) 764-5298
                        Big Rapids: Abigail S. Timme Library,
                        Ferris State University                 (616) 592-3602
                        Detroit Public Library                  (313) 833-1450
Minnesota               Minneapolis Public Library and
                        Information Center                      (612) 372-6570
Mississippi             Jackson: Mississippi Library Commission (601) 359-1036
Missouri                Kansas City: Linda Hall Library         (816) 363-4600
                        St. Louis Public Library                (314) 241-2288
                                                                 Ext. 390
Montana                 Butte: Montana College of Mineral
                        Science and Technology Library          (406) 496-4281
Nebraska                Lincoln: Engineering Library, University
                        of Nebraska-Lincoln                     (402) 472-3411
Nevada                  Reno: University of Nevada, Reno
                        Library                                 (702) 784-6579
New Hampshire           Durham: University of New Hampshire
                        Library                                 (603) 862-1777
New Jersey              Newark Public Library                   (201) 733-7782
                        Piscataway: Library of Science and
                        Medicine, Rutgers University            (908) 445-2895
New Mexico              Albuquerque: University of New Mexico
                        General Library                         (505) 277-4412
New York                Albany: New York State Library          (518) 474-5355
                        Buffalo and Erie County Public Library  (716) 858-7101
                        New York Public Library (The Research
                        Libraries)                              (212) 930-0917
North Carolina          Raleigh: D.H. Hill Library, North
                        Carolina State University               (919) 515-3280
North Dakota            Grand Forks: Chester Fritz Library,
                        University of North Dakota              (701) 777-4888
Ohio                    Cincinnati and Hamilton County, Public
                        Library of                              (513) 369-6936
                        Cleveland Public Library                (216) 623-2870
                        Columbus: Ohio State University
                        Libraries                               (614) 292-6175
                        Toledo/Lucas County Public Library      (419) 259-5212
Oklahoma                Stillwater: Oklahoma State University
                        Center for International Trade
                        Development                             (405) 744-7086
Oregon                  Salem: Oregon State Library             (503) 378-4239
Pennsylvania            Philadelphia, The Free Library of       (215) 686-5331
                        Pittsburgh, Carnegie Library of         (412) 622-3138
                        University Park: Pattee Library,
                        Pennsylvania State University           (814) 865-4861
Puerto Rico             Mayaquez General Library,
                        University of Puerto Rico               Not Yet
Rhode Island            Providence Public Library               (401) 455-8027
South Carolina          Clemson University Libraries            (803) 656-3024
South Dakota            Rapid City: Devereaux Library, South
                        Dakota School of Mines and
                        Technology                              (605) 394-6822
Tennessee               Memphis & Shelby County Public Library
                        and Information Center                  (901) 725-8877
                        Nashville: Stevenson Science Library,
                        Vanderbilt University                   (615) 322-2775
Texas                   Austin: McKinney Engineering Library,
                        University of Texas at Austin           (512) 495-4500
                        College Station: Sterling C. Evans
                        Library, Texas A & M University         (409) 845-3826
                        Dallas Public Library                   (214) 670-1468
                        Houston: The Fondren Library, Rice
                        University                              (713) 527-8101
                                                                 Ext. 2587
Utah                    Salt Lake City: Marriott Library,
                        University of Utah                      (801) 581-8394
Virginia                Richmond: James Branch Cabell Library,
                        Virginia Commonwealth University        (804) 828-1104
Washington              Seattle: Engineering Library,
                        University of Washington                (206) 543-0740
West Virginia           Morgantown: Evansdale Library, West
                        Virginia University                     (304) 293-2510
Wisconsin               Madison: Kurt F. Wendt Library,
                        University of Wisconsin Madison         (608) 262-6845
                        Milwaukee Public Library                (414) 286-3051
Wyoming                 Casper: Natrona County Public Library   (307) 237-4935