US3369733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine-compressor type machine
Assignee: FREE PISTON DEV CO Ltd
•
Filing: 1965-11-01
•
Granted: 1968-02-20
•
Expires: 1985-11-01
Abstract
No abstract record available.
Inventors
- 👤 James S Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:15
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/28; F02B75/282; F01; F01B; F01B7/00; F01B7/02; F01B7/04; F01B7/12; F04; F04B; F04B31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US461930A
Cited
US1357911A
Cited
US1893045A
Cited
US2079156A
Cited
FR802003A
Cited
US2166211A
Cited
US2305310A
Cited
US2647498A
Cited
US3119462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |