US3477941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating coal
Assignee: Universal Oil Products Co
•
Filing: 1968-01-25
•
Granted: 1969-11-11
•
Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 Edwin F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/06; C10G1/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1687763A
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US1672231A
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US1861355A
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US1940648A
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US1934023A
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US2379077A
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US2681300A
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US3075912A
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US3018242A
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US3018241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |