US2853575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow-responsive device
Assignee: Phillips Petroleum Co
•
Filing: 1955-05-09
•
Granted: 1958-09-23
•
Expires: 1975-05-09
Abstract
No abstract record available.
Inventors
- 👤 Orvel B Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:41
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2033084A
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US2494124A
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US2523666A
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US2653753A
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US2697984A
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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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |