US3036810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface valve apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1957-08-12
•
Granted: 1962-05-29
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Martin B Conrad
- 👤 Jr Hiram H Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:10
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18304; Y10T74/18312; Y10T74/1832; Y10T74/18328
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US267793A
Cited
US1885548A
Cited
US699367A
Cited
FR503054A
Cited
US1645273A
Cited
US1766224A
Cited
US1734649A
Cited
US2014314A
Cited
US2076839A
Cited
US2123183A
Cited
US2713911A
Cited
US2853265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |