US2876434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating and control system
Assignee: Phillips Petroleum Co
•
Filing: 1951-10-01
•
Granted: 1959-03-03
•
Expires: 1971-10-01
Abstract
No abstract record available.
Inventors
- 👤 Lyman M Oberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:51
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; E21B43/00; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1814524A
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US1911949A
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US2063354A
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US2278532A
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US2307171A
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US2338872A
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US2682652A
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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) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |