US1239639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary air-inlet valve for gas-engines.
Assignee: Individual
•
Filing: 1916-08-30
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Granted: 1917-09-11
•
Expires: 1936-08-30
Abstract
No abstract record available.
Inventors
- 👤 John Arthur Torrens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
F; F02; F02M; F02M21/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749; Y10T137/7837; Y10T137/7897; Y10T137/8158; Y10T137/8225; Y10T137/8275
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) | 1920-09-10 | 1921-03-12 | 1921-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-09-10 | 1925-03-12 | 1925-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-09-10 | 1929-03-12 | 1929-09-11 | $7700.00 | Window Closed / Lapsed |