Patent US3372679A successfully refreshed from Google Patents.
US3372679A
Expired / Lapsed
US
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Fuel tank venting system
Assignee: Desa International LLC
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Filing: 1966-04-27
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Granted: 1968-03-12
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Expires: 1986-04-27
Abstract
No abstract record available.
Inventors
- 👤 William H Aitken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:49
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A PORTABLE TOOL DRIVEN BY AN ENGINE UTILIZING A VOLATILE FUEL, A FUEL TANK HAVING AN OPENING THEREIN TO PROVIDE ACCESS TO THE INTERIOR OF SAID TANK, REMOVABLE CAP MEANS CLOSING OFF SAID OPENING, AN EXPANSION CHAMBER LOCATED OUTSIDE OF AND ADJACENT TO SAID TANK, VALVE MEANS THROUGH WHICH SAID FUEL AND AIR CAN PASS BETWEEN SAID FUEL TANK AND SAID EXPANSION CHAMBER, SAID VALVE MEANS BEING ACTUATED BY PREDETERMINED PRESSURE CONDITIONS WITHIN SAID FUEL TANK, AIR VENT MEANS HAVING A FIRST PORTION THEREOF IN COMMUNICATION WITH SAID EXPANSION CHAMBER AND HAVING A SECOND PORTION CONNECTED TO A SECOND CHAMBER WHICH IS OPEN TO ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
107 words
IN A PORTABLE TOOL DRIVEN BY AN ENGINE UTILIZING A VOLATILE FUEL, A FUEL TANK HAVING AN OPENING THEREIN TO PROVIDE ACCESS TO THE INTERIOR OF SAID TANK, REMOVABLE CAP MEANS CLOSING OFF SAID OPENING, AN EXPANSION CHAMBER LOCATED OUTSIDE OF AND ADJACENT TO SAID TANK, VALVE MEANS THROUGH WHICH SAID FUEL AND AIR CAN PASS BETWEEN SAID FUEL TANK AND SAID EXPANSION CHAMBER, SAID VALVE MEANS BEING ACTUATED BY PREDETERMINED PRESSURE CONDITIONS WITHIN SAID FUEL TANK, AIR VENT MEANS HAVING A FIRST PORTION THEREOF IN COMMUNICATION WITH SAID EXPANSION CHAMBER AND HAVING A SECOND PORTION CONNECTED TO A SECOND CHAMBER WHICH IS OPEN TO ATMOSPHERIC PRESSURE.
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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) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |