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Patent US3539496A successfully refreshed from Google Patents.
US3539496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low-sulfur fuel oil
Assignee: Universal Oil Products Co
•
Filing: 1968-10-28
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Granted: 1970-11-10
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Expires: 1988-10-28
Abstract
No abstract record available.
Inventors
- 👤 Laurence R Steenberg
- 👤 Frank Stolfa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2327099A
Cited
US1932174A
Cited
US2282451A
Cited
US2339918A
Cited
US2355366A
Cited
US3409538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |