Patent US2120006A successfully refreshed from Google Patents.
Patent US2900998A successfully refreshed from Google Patents.
US2900998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Phillips Petroleum Co
•
Filing: 1955-12-01
•
Granted: 1959-08-25
•
Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Russell W Lortz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7855; Y10T137/7898; Y10T137/7903; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2154; Y10T74/2156
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE242912C
Cited
US1804953A
Cited
US1744798A
Cited
US2262726A
Cited
US2588775A
Cited
US2501060A
Cited
US2717001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |