Patent US3107659A successfully refreshed from Google Patents.
US3107659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-cycle internal combustion engine
Assignee: ZF Friedrichshafen AG
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Filing: 1960-12-28
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Granted: 1963-10-22
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Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 Steinlein Gustav
- 👤 Hehn Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:37
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/02; F02B33/28; F02B33/30; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN A TWO-CYCLE INTERNAL COMBUSTION ENGINE, A CYLINDER BLOCK DEFINITION A COMBUSTION CHAMBER, A CRANKCASE, AT LEAST TWO TRANSFER PASSAGES EXTENDING WITHIN SAID BLOCK AND TERMINATING IN SAID CHAMBER AND CRANKCASE, A SINGLE INTAKE CONDUIT, CHECK VALVE MEANS IN SAID CONDUIT, AND AT LEAST TWO CONNECTING DUCTS EXTENDING WITHIN SAID BLOCK, EACH OF SAID DUCTS COMMUNICATING AT ONE END WITH ONE OF SAID PASSAGES AT A POINT INTERMEDIATE SAID TERMINALS, SAID DUCTS FORMING A SUBSTANTIALLY SEMI-ANNULAR COMPOSITE CONDUIT HAVING A SUBSTANTIALLY SEMI-ANNULAR COMPOSITE CONDUIT COMMUNICATING WITH SAID VALVE MEANS AT SAID CENTRAL OR BIGHT PORTION.
Claim 2
Dependent Claim
95 words
IN A TWO-CYCLE INTERNAL COMBUSTION ENGINE, A CYLINDER BLOCK DEFINITION A COMBUSTION CHAMBER, A CRANKCASE, AT LEAST TWO TRANSFER PASSAGES EXTENDING WITHIN SAID BLOCK AND TERMINATING IN SAID CHAMBER AND CRANKCASE, A SINGLE INTAKE CONDUIT, CHECK VALVE MEANS IN SAID CONDUIT, AND AT LEAST TWO CONNECTING DUCTS EXTENDING WITHIN SAID BLOCK, EACH OF SAID DUCTS COMMUNICATING AT ONE END WITH ONE OF SAID PASSAGES AT A POINT INTERMEDIATE SAID TERMINALS, SAID DUCTS FORMING A SUBSTANTIALLY SEMI-ANNULAR COMPOSITE CONDUIT HAVING A SUBSTANTIALLY SEMI-ANNULAR COMPOSITE CONDUIT COMMUNICATING WITH SAID VALVE MEANS AT SAID CENTRAL OR BIGHT PORTION.
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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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |