Patent US2291522A successfully refreshed from Google Patents.
US2291522A
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US
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Heating oils
Assignee: Pure Oil Co
•
Filing: 1940-07-29
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Granted: 1942-07-28
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Expires: 1960-07-29
Abstract
No abstract record available.
Inventors
- 👤 William J Backoff
- 👤 Norman D Williams
- 👤 John F O'loughlin
- 👤 Harry L Moir
- 👤 John S Yule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:48
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/182; C10L1/1822; C10L1/1824; C10L1/185; C10L1/1857; C10L1/19; C10L1/1905
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) | 1945-07-27 | 1946-01-26 | 1946-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-27 | 1950-01-26 | 1950-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-27 | 1954-01-26 | 1954-07-28 | $7700.00 | Window Closed / Lapsed |