Patent US3473606A successfully refreshed from Google Patents.
US3473606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-charged pressure responsive safety valve
Assignee: Cook Testing Co
•
Filing: 1965-09-29
•
Granted: 1969-10-21
•
Expires: 1985-09-29
Abstract
No abstract record available.
Inventors
- 👤 John S Page Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:30
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; F16K15/06; F16K15/063; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7904; Y10T137/7905; Y10T137/7922; Y10T137/7923
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1641741A
Cited
US2071391A
Cited
US2128253A
Cited
US2251244A
Cited
US2509839A
Cited
US2959227A
Cited
US3090443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |