Patent US3241747A successfully refreshed from Google Patents.
US3241747A
Expired / Lapsed
US
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Oil pump and oil system for air compressor
Assignee: Individual
•
Filing: 1964-07-15
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Granted: 1966-03-22
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Expires: 1984-07-15
Abstract
No abstract record available.
Inventors
- 👤 Agis I Mihalakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:07
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/3441; F04C18/3442; F04C29/00; F04C29/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A ROTARY PUMP, THE COMBINATION OF: A ROTARY SHAFT HAVING AN OUTER CYLINDRICAL SURFACE INTERSECTED BY A CENTRAL TRANSVERSE SLOT, A STATIONARY BODY HAVING A BORE ENCIRCLING A PORTION OF THE SHAFT, SAID BORE BEING DEFINED BY AN INTERNAL CYLINDRICAL SURFACE LATERALLY OFFSET WITH RESPECT TO SAID SHAFT SURFACE, THE BODY HAVING A GROOVE CONCENTRIC WITH SAID INTERSECTING SAID BORE SURFACE, A PAIR OF DUPLICATE VANES SLIDABLY MOUNTED IN SAID SLOT TO RECIPROCATE RADIALLY, EACH VANE HAVING AN END PORTION PROVIDED WITH A CONVEX-CURVED SURFACE AND A RADIALLY PROJECTING LIP, A SPRING INTERPOSED BETWEEN SAID VANES ACTING TO MAINTAIN THEIR RESPECTIVE CONVEX-CURVED SURFACES IN SLIDING CONTACT WITH SAID BORE SURFACE, THE LIP OF EACH VANE BEING RECEIVED IN SAID GROOVE, THE BODY HAVING AN INLET PORT AND A DISCHARGE PORT, AND THE BODY HAVING PASSAGE MEANS ON OPPOSITE SIDES OF SAID TANGENT PORTION COMMUNICATING WITH SAID BORE AND WITH EACH OF SAID PORTS, RESPECTIVELY.
Claim 2
Dependent Claim
155 words
IN A ROTARY PUMP, THE COMBINATION OF: A ROTARY SHAFT HAVING AN OUTER CYLINDRICAL SURFACE INTERSECTED BY A CENTRAL TRANSVERSE SLOT, A STATIONARY BODY HAVING A BORE ENCIRCLING A PORTION OF THE SHAFT, SAID BORE BEING DEFINED BY AN INTERNAL CYLINDRICAL SURFACE LATERALLY OFFSET WITH RESPECT TO SAID SHAFT SURFACE, THE BODY HAVING A GROOVE CONCENTRIC WITH SAID INTERSECTING SAID BORE SURFACE, A PAIR OF DUPLICATE VANES SLIDABLY MOUNTED IN SAID SLOT TO RECIPROCATE RADIALLY, EACH VANE HAVING AN END PORTION PROVIDED WITH A CONVEX-CURVED SURFACE AND A RADIALLY PROJECTING LIP, A SPRING INTERPOSED BETWEEN SAID VANES ACTING TO MAINTAIN THEIR RESPECTIVE CONVEX-CURVED SURFACES IN SLIDING CONTACT WITH SAID BORE SURFACE, THE LIP OF EACH VANE BEING RECEIVED IN SAID GROOVE, THE BODY HAVING AN INLET PORT AND A DISCHARGE PORT, AND THE BODY HAVING PASSAGE MEANS ON OPPOSITE SIDES OF SAID TANGENT PORTION COMMUNICATING WITH SAID BORE AND WITH EACH OF SAID PORTS, RESPECTIVELY.
References Cited (Backward Citations)
US2037894A
Cited
US2128388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |