Patent US2473959A successfully refreshed from Google Patents.
Patent US2685892A successfully refreshed from Google Patents.
US2685892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control unit
Assignee: OIL CENTER TOOL CO
•
Filing: 1951-01-26
•
Granted: 1954-08-10
•
Expires: 1971-01-26
Abstract
No abstract record available.
Inventors
- 👤 Jack E Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:20
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86976
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US318889A
Cited
US336724A
Cited
US620829A
Cited
US822306A
Cited
US742308A
Cited
US801682A
Cited
US1046548A
Cited
FR609081A
Cited
US1636859A
Cited
US1655729A
Cited
US1777128A
Cited
GB483835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |