Did You Know...
...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
PatentStorm News
Make the Most of PatentStorm
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest patents by subscribing to an RSS feed.
Got questions? Ask a Patent Expert!
Registered users: Manage your profile, comments and alerts.
US Patent 4767292 - Electrical commutation apparatus
US Patent Issued on August 30, 1988
Estimated Patent Expiration Date:
July 20, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
July 20, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA fluid motor having a gerotor gear set includes a first member having internal teeth and a second member having external teeth. The second member is rotatably and orbitally mounted within the first member. The teeth of the first and second members cooperate to define a plurality of variable volume working chambers. Some of said working chambers expand and other of said working chambers contract upon relative rotatable and orbital movement between said first and second members. A plurality of electrically controlled valves are provided, each working chamber having an associated valve. Each valve selectively communicates, in one condition, its associated working chamber with an inlet passage, which is, in turn, connected to a source or pressurized fluid, or, in a second condition, its associated working chamber to an outlet passage, which is, in turn, connected to a reservoir. Each of the valves is responsive to a respective electrical control signal for placing the valve in the first or second condition. | InventorAssigneeApplicationNo. 07/075445 filed on 07/20/1987US Classes:418/2, WITH SIGNAL, INDICATOR OR TRANSPARENT INSPECTION MEANS418/270, MISCELLANEOUS418/61.3, Rotor has one less lobe than cylinder (i.e., Gerotor type)91/362, Means provides incremental movements (e.g., stepper type, etc.)91/53ENGINE ROTATING OR STARTING TYPEField of Search418/2WITH SIGNAL, INDICATOR OR TRANSPARENT INSPECTION MEANSExaminersPrimary: Vrablik, John J.Attorney, Agent or FirmUS Patent ReferencesRe25257, 2976843, 2999482, 3156157, 3289602, 3778198, 3799201, 3917437, 3922120, 3996901, Rotary piston mechanismIssued on: 12/14/1976 Inventor: Gale , et al.4087215, Gerotor gearset device Issued on: 05/02/1978 Inventor: Miller4219313, Commutator valve construction Issued on: 08/26/1980 Inventor: Miller , et al.4380420, Internal gear machine with rotary valve disk Issued on: 04/19/1983 Inventor: Wusthof , et al.4411606Gerotor gear set device with integral rotor and commutator Issued on: 10/25/1983 Inventor: Miller International ClassesF04C 2/10 (20060101)F04C 2/00 (20060101) |
