Patent US3900942A successfully refreshed from Google Patents.
US3900942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a rotary motor or pump
Assignee: Individual
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Filing: 1973-12-11
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Granted: 1975-08-26
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Expires: 1993-12-11
Abstract
Abstract A device which is capable of operating as a pump or motor having a housing, an elliptically shaped cavity within the housing and a slideably mounted vane rotatably mounted within the cavity. It is essential that every diameter of the cavity passing through the central axis thereof be of equal length. As a result thereof the vane can be manufactured of a standard length and the device can operate with a minimum amount of wear as either a pump or motor.
Inventors
- 👤 Glenn C Ainsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:39
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C21/104; F01C21/106; B; B23; B23P; B23P15/00; F01C1/00; F01C1/30; F01C1/34; F01C1/344; F01C1/3441; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49231; Y10T29/49234; Y10T29/49236; Y10T29/49245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A method for forming an elliptically shaped cavity in a housing having an axis at a preselected point therein so that all diameters of said cavity passing through said axis of the housing are substantially the same length, comprising the steps of: a. cutting a predetermined outside diameter of said housing utilizing said preselected point in said housing as the axis thereof, b. moving slightly off said axis of said housing and defining a new point, c. using said new point as the center thereof, forming a cavity within said housing having a diameter less than said housing diameter, d. defining at least one other point by moving said new center point no more than 5* to either side of a line drawn between said new center point and said axis of said housing at the same distance from said axis of said housing as said new center point, and e. forming said elliptical cavity from said original cavity by utilizing said other point as the center thereof.
Claim 2
Independent Claim
168 words
A method for forming an elliptically shaped cavity in a housing having an axis at a preselected point therein so that all diameters of said cavity passing through said axis of the housing are substantially the same length, comprising the steps of: a. cutting a predetermined outside diameter of said housing utilizing said preselected point in said housing as the axis thereof, b. moving slightly off said axis of said housing and defining a new point, c. using said new point as the center thereof, forming a cavity within said housing having a diameter less than said housing diameter, d. defining at least one other point by moving said new center point no more than 5* to either side of a line drawn between said new center point and said axis of said housing at the same distance from said axis of said housing as said new center point, and e. forming said elliptical cavity from said original cavity by utilizing said other point as the center thereof.
References Cited (Backward Citations)
US1719135A
Cited
US1846557A
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US2353965A
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US2359903A
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US2410596A
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US2585406A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |