US2433639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable combustion chamber for internal-combustion engines
Assignee: Individual
•
Filing: 1942-09-24
•
Granted: 1947-12-30
•
Expires: 1962-09-24
Abstract
No abstract record available.
Inventors
- 👤 Woodruff John Melvin
- 👤 Woodruff Jesse Alvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:41
CPC Classifications
F; F02; F02D; F02D15/00; F02D15/04; F02B; F02B75/00; F02B75/04; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0235
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE18595E
Cited
US1404366A
Cited
US1566376A
Cited
US1684550A
Cited
GB272863A
Cited
FR751217A
Cited
US2120012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |