US2758580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: HALLETT Manufacturing CO
•
Filing: 1951-03-08
•
Granted: 1956-08-14
•
Expires: 1971-03-08
Abstract
No abstract record available.
Inventors
- 👤 Vernon W Balzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:54
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01P; F01P1/00; F01P1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2306554A
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US2248516A
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US2336989A
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US2366701A
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FR993666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |