US2927765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1956-04-09
•
Granted: 1960-03-08
•
Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 Marion H Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB222794A
Cited
US1657663A
Cited
US1912358A
Cited
US2246519A
Cited
US2664095A
Cited
US2442746A
Cited
US2464917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |