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US2921738A
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Polynomial multiplier
Assignee: Phillips Petroleum Co
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Filing: 1955-04-18
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Granted: 1960-01-19
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Expires: 1975-04-18
Abstract
No abstract record available.
Inventors
- 👤 John P Greening
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:13
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/288; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2425405A
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US2394924A
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US2679356A
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US2742613A
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US2801351A
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US2794965A
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US2703389A
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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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |