Patent US1942519A successfully refreshed from Google Patents.
Patent US2481491A successfully refreshed from Google Patents.
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 20:48
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1742887A
Cited
DE525509C
Cited
US1876509A
Cited
US1428793A
Cited
US1416424A
Cited
US1431054A
Cited
US1628424A
Cited
US1610290A
Cited
US1884256A
Cited
US1858302A
Cited
US1783405A
Cited
US1825372A
Cited
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 |