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US1999442A
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Combustion apparatus
Assignee: BLANCHE L DOBLE
•
Filing: 1932-02-18
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Granted: 1935-04-30
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Expires: 1952-02-18
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Corbett
- 👤 Ralph N Doble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:59
CPC Classifications
F; F23; F23B; F23B30/00; F23B30/02; F23B50/00; F23B50/02; F23B50/04; F23B50/10; F23B2101/00; F23B2700/00; F23B2700/011
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) | 1938-04-29 | 1938-10-29 | 1939-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-29 | 1942-10-29 | 1943-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-29 | 1946-10-29 | 1947-04-30 | $7700.00 | Window Closed / Lapsed |