US2877866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved quenching method
Assignee: Phillips Petroleum Co
•
Filing: 1954-08-26
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Granted: 1959-03-17
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Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Clyde H Mathis
- 👤 Walter B Polk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
F; F28; F28F; F28F19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2022229A
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US2198142A
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US2371545A
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US2543743A
Cited
US2676670A
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US2753309A
Cited
US2747680A
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US2739903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |