Patent US4539253A successfully refreshed from Google Patents.
Patent US2193240A successfully refreshed from Google Patents.
US2193240A
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Method of and apparatus for controlling mixing of combustible gases
Assignee: Cutler Hammer Inc
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Filing: 1937-10-25
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Granted: 1940-03-12
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Expires: 1957-10-25
Abstract
No abstract record available.
Inventors
- 👤 Edwin X Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:11
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/027; B; B01; B01F; B01F23/00; B01F23/10; B01F23/19; B01F23/191; B01F35/00; B01F35/20; B01F35/21; B01F35/211; B01F35/2113; B01F35/22; B01F35/221; B01F35/2211; F23N5/00; F23N5/18; F23N5/188; F23N2221/00; F23N2221/10; F23N2235/00; F23N2235/02; F23N2235/06; F23N2235/12; F23N2235/18; F23N2235/20; F23N2235/24; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0346; Y10T137/0368; Y10T137/2278; Y10T137/2322; Y10T137/2496; Y10T137/2499; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
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) | 1943-03-12 | 1943-09-11 | 1944-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-12 | 1947-09-11 | 1948-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-12 | 1951-09-11 | 1952-03-12 | $7700.00 | Window Closed / Lapsed |