US2815316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating coal
Assignee: Wyeth Holdings LLC
•
Filing: 1952-01-18
•
Granted: 1957-12-03
•
Expires: 1972-01-18
Abstract
No abstract record available.
Inventors
- 👤 Kruppa William Joseph
- 👤 John B Rinckhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:23
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10L9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2560357A
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US2586703A
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US2636688A
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US2666269A
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US2656308A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |