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US2822793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stroke internal combustion engines
Assignee: Individual
•
Filing: 1956-04-24
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Granted: 1958-02-11
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Expires: 1976-04-24
Abstract
No abstract record available.
Inventors
- 👤 Bellwinkel Curt
- 👤 Stuempfig Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
F; F02; F02B; F02B25/00; F02B2720/00; F02B2720/13; F02B2720/133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1012288A
Cited
GB191307926A
Cited
US1229989A
Cited
US1217020A
Cited
US1746768A
Cited
US1795551A
Cited
US2317772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |