US2040778A
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Combustion efficiency adjusting apparatus
Assignee: Doherty Research Co
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Filing: 1932-01-28
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Granted: 1936-05-12
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Expires: 1952-01-28
Abstract
No abstract record available.
Inventors
- 👤 John D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F02D35/00; F02D35/0015; F02D35/0046; F02D35/0053; F02D35/0069; F02D41/30; F02D41/3094; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0241
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) | 1939-05-12 | 1939-11-11 | 1940-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-12 | 1943-11-11 | 1944-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-12 | 1947-11-11 | 1948-05-12 | $7700.00 | Window Closed / Lapsed |