US2201774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing carbon and other deposits from internal combustion engines
Assignee: Individual
•
Filing: 1939-01-09
•
Granted: 1940-05-21
•
Expires: 1959-01-09
Abstract
No abstract record available.
Inventors
- 👤 Hofele George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:35
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/04; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1832; F02B75/22
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) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |