US1373509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined gas and steam system for engines
Assignee: KILLMAN DEV CO
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Filing: 1917-09-11
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Granted: 1921-04-05
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Expires: 1937-09-11
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Killman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:14
CPC Classifications
F; F02; F02G; F02G5/00; F02G5/02; F02G5/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1924-04-04 | 1924-10-04 | 1925-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-04-04 | 1928-10-04 | 1929-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-04-04 | 1932-10-04 | 1933-04-05 | $7700.00 | Window Closed / Lapsed |