US2439150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engine
Assignee: Individual
•
Filing: 1943-03-31
•
Granted: 1948-04-06
•
Expires: 1963-03-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:26
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/26; F02B75/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US835483A
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US847489A
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US877977A
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US1149528A
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FR432377A
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US1347762A
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US1456479A
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US1612046A
Cited
US1787673A
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DE577663C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |