Patent US2235140A successfully refreshed from Google Patents.
US2235140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable internal combustion engine
Assignee: Individual
•
Filing: 1938-03-21
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Granted: 1941-03-18
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Expires: 1958-03-21
Abstract
No abstract record available.
Inventors
- 👤 Douglas R Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:10
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/24; B63H20/245; B63H20/08; B63H20/10; B63H20/12; B63H21/00; B63H21/30; B63H21/305; F; F02; F02B; F02B61/00; F02B61/04; F02B61/045
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) | 1944-03-17 | 1944-09-16 | 1945-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-17 | 1948-09-16 | 1949-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-17 | 1952-09-16 | 1953-03-18 | $7700.00 | Window Closed / Lapsed |