US2977759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous external combustion engines
Assignee: Individual
•
Filing: 1958-03-20
•
Granted: 1961-04-04
•
Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 Milliken Humphreys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:36
CPC Classifications
F; F02; F02G; F02G3/00; F02G3/02; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2593849A
Cited
CA672255A
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US811809A
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US1235145A
Cited
US1849347A
Cited
FR675693A
Cited
US2248639A
Cited
US2669839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |