Patent US4136039A successfully refreshed from Google Patents.
Patent US2623938A successfully refreshed from Google Patents.
US2623938A
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Assignee: Phillips Petroleum Co
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Filing: 1949-03-21
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Granted: 1952-12-30
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Expires: 1969-03-21
Abstract
No abstract record available.
Inventors
- 👤 Marion E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:57
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01V1/181
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US378552A
Cited
GB274575A
Cited
US1749015A
Cited
US2021330A
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US2297251A
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US2417077A
Cited
US2487029A
Cited
US2471542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |