Patent US1143587A successfully refreshed from Google Patents.
US1453560A
Expired / Lapsed
US
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Attachment for internal-combustion engines
Assignee: Individual
•
Filing: 1920-08-20
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Granted: 1923-05-01
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Expires: 1940-08-20
Abstract
No abstract record available.
Inventors
- 👤 Walter W Whetstine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:13
CPC Classifications
F; F02; F02M; F02M1/00; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4321
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) | 1926-04-30 | 1926-10-30 | 1927-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-30 | 1930-10-30 | 1931-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-30 | 1934-10-30 | 1935-05-01 | $7700.00 | Window Closed / Lapsed |