Patent US3303831A successfully refreshed from Google Patents.
US3303831A
Expired / Lapsed
US
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Variable compression ratio piston and valve
Assignee: Individual
•
Filing: 1964-09-02
•
Granted: 1967-02-14
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Expires: 1984-09-02
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:10
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/04; F02B75/044; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2247032A
Cited
US2642088A
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US2553340A
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US2775471A
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US2742027A
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US3014468A
Cited
US3038458A
Cited
US3068894A
Cited
US3215457A
Cited
US3156162A
Cited
US3205878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |