Patent US1921607A successfully refreshed from Google Patents.
US1921607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trunk piston for diesel engines
Assignee: Individual
•
Filing: 1931-06-23
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Granted: 1933-08-08
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Expires: 1951-06-23
Abstract
No abstract record available.
Inventors
- 👤 Charles G Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:27
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32861; Y10T403/32877
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) | 1936-08-07 | 1937-02-06 | 1937-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-07 | 1941-02-06 | 1941-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-07 | 1945-02-06 | 1945-08-08 | $7700.00 | Window Closed / Lapsed |