US2104802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic differential piston for internal combustion engines
Assignee: Individual
•
Filing: 1935-03-15
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Granted: 1938-01-11
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Expires: 1955-03-15
Abstract
No abstract record available.
Inventors
- 👤 Einar H Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
F; F02; F02F; F02F3/00; F02B; F02B75/00; F02B75/04; F02B75/045; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448
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) | 1941-01-10 | 1941-07-12 | 1942-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-10 | 1945-07-12 | 1946-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-10 | 1949-07-12 | 1950-01-11 | $7700.00 | Window Closed / Lapsed |