Patent US2992711A successfully refreshed from Google Patents.
US3430441A
Expired / Lapsed
US
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Engine for converting energy by thermal expansion of solids
Assignee: Individual
•
Filing: 1967-09-19
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Granted: 1969-03-04
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Expires: 1987-09-19
Abstract
No abstract record available.
Inventors
- 👤 John L Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:28
CPC Classifications
F; F03; F03G; F03G7/00; F03G7/06; F03G7/061; F03G7/0613; F03G7/064; F03G7/0641
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US534871A
Cited
US1258368A
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US2931189A
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US3070953A
Cited
US3303642A
Cited
US3316415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |