Patent US1853581A successfully refreshed from Google Patents.
Patent US3221663A successfully refreshed from Google Patents.
US3221663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wash flow bearing system
Assignee: Chandler Evans Inc
•
Filing: 1964-05-20
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Granted: 1965-12-07
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Expires: 1984-05-20
Abstract
No abstract record available.
Inventors
- 👤 John J Schofield
- 👤 Francis P Schierberl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:41
CPC Classifications
F; F04; F04C; F04C13/00; F04C13/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN A GEAR-TYPE FUEL PUMP WHICH COMPRISES A FUEL INLET, A PUMPING CHAMBER, A FUEL FILTER CHARACTER, AND A FUEL DISCHARGE OUTLET, ALL CONNECTED IN FLOW SERIES: A PAIR OF INTERMESHING, PUMPING GEARS, EACH JOURNALED IN A PAIR OF OPPOSITELY DISPOSED FUEL PRESSURE-LOADED BEARINGS MOUNTED IN SAID PUMPING CHAMBER; A WASH-FLOW FILTER HAVING A TUBULAR FILTERING ELEMENT IN SAID FILTER CHAMBER; MEANS FOR PASSING THROUGH SAID FILTERING ELEMENT A MINOR FRACTION OF THE FUEL FLOWING THROGH SAID FILTER; AND MEANS FOR FEEDING SAID FRACTIUON OF FUEL, UNDER SUBSTANTIALLY PUMP DISCHARGE PRESSURE, TO AND THROUGH THE INTERSPACES BETWEEN THE SIDES OF EACH GEAR AND THE ADJACENT END OF EACH
Claim 2
Dependent Claim
108 words
IN A GEAR-TYPE FUEL PUMP WHICH COMPRISES A FUEL INLET, A PUMPING CHAMBER, A FUEL FILTER CHARACTER, AND A FUEL DISCHARGE OUTLET, ALL CONNECTED IN FLOW SERIES: A PAIR OF INTERMESHING, PUMPING GEARS, EACH JOURNALED IN A PAIR OF OPPOSITELY DISPOSED FUEL PRESSURE-LOADED BEARINGS MOUNTED IN SAID PUMPING CHAMBER; A WASH-FLOW FILTER HAVING A TUBULAR FILTERING ELEMENT IN SAID FILTER CHAMBER; MEANS FOR PASSING THROUGH SAID FILTERING ELEMENT A MINOR FRACTION OF THE FUEL FLOWING THROGH SAID FILTER; AND MEANS FOR FEEDING SAID FRACTIUON OF FUEL, UNDER SUBSTANTIALLY PUMP DISCHARGE PRESSURE, TO AND THROUGH THE INTERSPACES BETWEEN THE SIDES OF EACH GEAR AND THE ADJACENT END OF EACH
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |