US2831626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free-piston compressors or gas generators
Assignee: Individual
•
Filing: 1954-08-16
•
Granted: 1958-04-22
•
Expires: 1974-08-16
Abstract
No abstract record available.
Inventors
- 👤 Perrott Francis Cyril
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:11
CPC Classifications
F; F02; F02C; F02C5/00; F02C5/06; F02C5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1741731A
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US1835834A
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US1944960A
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US1931164A
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US2038442A
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US2064976A
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US2090709A
Cited
GB596243A
Cited
US2458147A
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US2461224A
Cited
CH250732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |