US2481491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel oil system for feeding a plurality of burners, including means for emptying unused oil
Assignee: Armstrong World Industries Inc
•
Filing: 1942-12-30
•
Granted: 1949-09-13
•
Expires: 1962-12-30
Abstract
No abstract record available.
Inventors
- 👤 Le Roy D Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:33
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/02; F23K5/06; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86131
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1416424A
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US1431054A
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US1610290A
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US1884256A
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US1858302A
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US1783405A
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US1825372A
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US1911902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |