Patent US2974227A successfully refreshed from Google Patents.
US2974227A
Expired / Lapsed
US
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Analyzer
Assignee: Phillips Petroleum Co
•
Filing: 1958-05-07
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Granted: 1961-03-07
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Expires: 1978-05-07
Abstract
No abstract record available.
Inventors
- 👤 Horace L Fisher
- 👤 Elmer C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1740673A
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DE927431C
Cited
US2417321A
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US2617940A
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US2694335A
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US2737591A
Cited
US2654845A
Cited
US2878388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |