Manual of U.S. Patent Classification
as of June 30, 2000

Class
322
ELECTRICITY: SINGLE GENERATOR SYSTEMS

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> ELECTRICITY: SINGLE GENERATOR SYSTEMS
1		PORTABLY MOUNTED
2R		NONMAGNETIC-TYPE GENERATOR
2A		. Electrostatic
3		RECIPROCATING AND/OR OSCILLATING-TYPE GENERATOR
4		WITH FLYWHEELS OR MASSIVE MOVING PARTS
5		WITH GENERATOR POLARITY CONTROL
6		. By control of excitation
7		COMBINED CONTROL OF GENERATING MEANS AND LOAD CIRCUIT
8		. Including load circuit-making and breaking
9		PLURAL DRIVING MEANS
10		WITH PHYSICAL STARTING AND/OR STOPPING OF THE GENERATOR
11		. Automatic in response to predetermined conditions
12		. Connecting and/or disconnecting generator and driving means
13		. Electric motor as driving means
14		COMBINED CONTROL OF GENERATOR AND DRIVING MEANS
15		. Simultaneous control
16		. . Electric motor
17		AUTOMATIC CONTROL OF GENERATOR OR DRIVING MEANS
18		. With time-delay in the response
19		. Antihunting or rate of change
20		. Power factor or phase relationships
21		. With line-drop compensation
22		. Plural conditions
23		. . Including an electrical condition
24		. . . Plural electrical conditions
25		. . . . Voltage and current
26		. Light or photosensitive control circuits
27		. Current output
28		. Voltage of generator or circuit supplied
29		. Speed or frequency of generator
30		. . Centrifugal of fly weight governor
31		. . Tachometer devices
32		. . Frequency responsive devices or networks
33		. Thermal conditions
34		. . In generator and/or driving means
35		. Fluid pressure including wind
36		. With respect to a reference or master device or quantity
37		. Electrical conditions in circuit other than that of generator being controlled
38		DRIVING MEANS CONTROL
39		. Electric motor control
40		POWER TRANSMITTING MECHANISM CONTROL
41		. Friction-type transmission
42		. . Belt drive
43		. . . Slip control
44		GENERATOR CONTROL
45		. Combined diverse generator controls
46		. Combined permanent magnet and wound field structure
47		. Induction generator
48		. Acyclic or homopolar-type generator
49		. Magnetic structure
50		. . Magnetic shunt for field flux
51		. . Rotor element
52		. . Stator element
53		. Odd number of brushes (e.g., 3rd brush type)
54		. Adjustable current-collecting mechanism
55		. . Movable circumferentially
56		. . . Continuously
57		. With nonexciting saturating means for generator structure
58		. With means for suppressing, eliminating or minimizing undesired frequencies
59		. With excitation winding and/or circuit control
60		. . Substitute or auxiliary starting source of excitation
61		. . Alternating current excitation
62		. . Plural sets of poles type of generator
63		. . Plural excitation windings
64		. . . Differentially related
65		. . . Interpole windings
66		. . . Compensating windings
67		. . Series-wound generator
68		. . Short circuiting of field winding
69		. . Circuit interruption
70		. . . Continuous make and break
71		. . Variable length field winding
72		. . Control by electric space discharge
73		. . . Discharge control discharge device
74		. . . Electric arc
75		. . Control by circuit impedance
76		. . . Plural impedances
77		. . . . Bridge arrangements
78		. . . . Tuned or resonant
79		. . . Unidirectionally conductive
80		. . . Resistance
81		. . . . Thermally varied resistance
82		. . . . Pressure-varied resistance
83		. . . . Short-circuited
84		. . . . . Continuous make and break
85		. . . . . Step by step
86		. . Plural sources of excitation voltage
87		. . . Dynamoelectric source
88		. . . Battery source
89		. With armature or primary circuit control
90		. . Plural armature circuits or windings
91		. . Short-circuiting of windings
92		. . . By auxiliary brushes diametrically opposed or 180 electrical degrees apart
93		. . Tapped or sectionalized
94		. . Circuit-making and/or breaking
95		. . By armature circuit impedance
96		. . . Plural impedances
97		. . . Resistance control
98		. . . . In circuit across brushes or in shunt to generator
99		WITH SIGNALS, INDICATORS, RECORDERS, TESTING, ETC.
100		MISCELLANEOUS
		******************************
		DIGESTS
		******************************
DIG 2		Generator field current-responsive systems
DIG 5		Hall effects elements
DIG 6		Ripple sensitive

Information Products Division -- Contacts

Questions regarding this report should be directed to:

U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231

tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov

---

Last Modified: 6 October 2000