US3138321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary vane pump
Assignee: Gast Manufacturing Corp
•
Filing: 1962-03-22
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Granted: 1964-06-23
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Expires: 1982-03-22
Abstract
No abstract record available.
Inventors
- 👤 Rolf A Bielefeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F03; F03C; F03C2/00; F03C2/30; F04C18/00; F04C18/30; F04C18/34; F04C18/344
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A ROTARY VANE PUMP, THE COMBINATION OF A HOUSING; A ROTOR HUB ECCENTRICALLY LOCATED IN SAID HOUSING; SAID HOUSING INCLUDING END PLATES; END SHAFTS EXTENDING FROM BOTH ENDS OF SAID ROTOR HUB INTO SAID END PLATES; AT LEAST MORE THAN FOUR ELONGATED SLOTS IN SAID ROTOR HUB FOR RECEIVING SLIDABLE VANES; SAID SLOTS EXTENDING PERPENDICULAR TO A DIAMETER OF SAID HUB AND EXTENDING BEYOND SAID DIAMETER; THE INNERMOST PORTIONS OF SAID SLOTS INCLUDING A PLURALITY OF LONGITUDINALLY SPACED RECESSES SEPARATED BY A PLURALITY OF STRENGTHENING RIBS FORMED INTEGRAL WITH THE CENTRAL PORTION OF SAID ROTOR HUB; AND A PLURALITY OF VANES IN SAID SLOTS HAVING COOPERATING PROJECTIONS TO FIT INTO SAID RECESSES AND COOPERATING CUT OUTS TO RECEIVE SAID RIBS TO ENABLE VANES WITH SAID CUT OUTS TO BE ACCOMMODATED IN SAID SLOTS WITHOUT DETRIMENTALLY WEAKENING SAID HUB.
Claim 2
Dependent Claim
139 words
IN A ROTARY VANE PUMP, THE COMBINATION OF A HOUSING; A ROTOR HUB ECCENTRICALLY LOCATED IN SAID HOUSING; SAID HOUSING INCLUDING END PLATES; END SHAFTS EXTENDING FROM BOTH ENDS OF SAID ROTOR HUB INTO SAID END PLATES; AT LEAST MORE THAN FOUR ELONGATED SLOTS IN SAID ROTOR HUB FOR RECEIVING SLIDABLE VANES; SAID SLOTS EXTENDING PERPENDICULAR TO A DIAMETER OF SAID HUB AND EXTENDING BEYOND SAID DIAMETER; THE INNERMOST PORTIONS OF SAID SLOTS INCLUDING A PLURALITY OF LONGITUDINALLY SPACED RECESSES SEPARATED BY A PLURALITY OF STRENGTHENING RIBS FORMED INTEGRAL WITH THE CENTRAL PORTION OF SAID ROTOR HUB; AND A PLURALITY OF VANES IN SAID SLOTS HAVING COOPERATING PROJECTIONS TO FIT INTO SAID RECESSES AND COOPERATING CUT OUTS TO RECEIVE SAID RIBS TO ENABLE VANES WITH SAID CUT OUTS TO BE ACCOMMODATED IN SAID SLOTS WITHOUT DETRIMENTALLY WEAKENING SAID HUB.
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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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |