| US 6,915,538 C1 (7030th) | ||
| SMOOTH START SYSTEM FOR POWER CHAIR | ||
| Thomas L. Treon, Versailles, Ohio, assignor to Midmark Corporation, Versailles, Ohio | ||
| Reexamination Request No. 90/010,015, Aug. 29, 2007. | ||
| Reexamination Certificate for Patent 6,915,538, issued Jul. 12, 2005, Appl. No. 684,044, Oct. 10, 2003. | ||
| Int. Cl. G05B 11/01; |
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| U.S. Cl. 5—611 |
| AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT: |
| Claims 14 and 27 are cancelled. |
| Claims 1, 16 and 29 are determined to be patentable as amended. |
| Claims 2-13, 15, 17-26, 28 and 30, dependent on an amended claim, are determined to be patentable. |
| 1. A method of moving a moveable support surface of a patient support apparatus, comprising: receiving input for initiating movement of the moveable support surface; and
in response to the input, automatically supplying a voltage supply signal to an electric motor, wherein the voltage supply signal is determined by sequencing through a plurality of reference voltages such that the voltage supply signal is configured to cause the electric motor to gradually accelerate the moveable support surface, wherein automatically supplying the voltage supply signal further includes processing a control signal indicative of a load and a patient weight and at least one of:
directional data indicative of a desired direction of movement of the support surface, a speed measurement, and a voltage level.
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