Patent US1720510A successfully refreshed from Google Patents.
US1720510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engine
Assignee: Individual
•
Filing: 1925-07-01
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Granted: 1929-07-09
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Expires: 1945-07-01
Abstract
No abstract record available.
Inventors
- 👤 Chorlton Alan Ernest Leofric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:54
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0002; F02F7/0012; F02B; F02B3/00; F02B3/06; F02F1/00; F02F1/02; F02F1/10; F02F1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-07-08 | 1933-01-07 | 1933-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-07-08 | 1937-01-07 | 1937-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-07-08 | 1941-01-07 | 1941-07-09 | $7700.00 | Window Closed / Lapsed |