Patent US1239882A successfully refreshed from Google Patents.
US1239882A
Expired / Lapsed
US
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Gas and air mixing device.
Assignee: WILLIAM B WARREN
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Filing: 1916-06-06
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Granted: 1917-09-11
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Expires: 1936-06-06
Abstract
No abstract record available.
Inventors
- 👤 Charles E Chalker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:07
CPC Classifications
F; F02; F02M; F02M21/00; F02M21/02; F02M21/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87652; Y10T137/8766; Y10T137/87917; Y10T137/88054
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 |