Patent US2447086A successfully refreshed from Google Patents.
US2447086A
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Backfire arrester and flash back preventer
Assignee: Union Carbide Corp
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Filing: 1944-01-15
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Granted: 1948-08-17
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Expires: 1964-01-15
Abstract
No abstract record available.
Inventors
- 👤 Malven L Olson
- 👤 Elwood A Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:51
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE16149E
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US802380A
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US1223308A
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FR477958A
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US1286089A
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US1497197A
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GB311165A
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US1907976A
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GB417767A
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US2220641A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |