US2815641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting system for free piston engines
Assignee: Cooper Bessemer Corp
•
Filing: 1952-01-16
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Granted: 1957-12-10
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Expires: 1972-01-16
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ramsey
- 👤 Willard A Morain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:24
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/02; F02C; F02C5/00; F02C5/06; F02C5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2439482A
Cited
US2215326A
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US2423720A
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US2434778A
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US2434877A
Cited
US2600251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |