US2699121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plunger lift
Assignee: National Supply Co
•
Filing: 1949-07-25
•
Granted: 1955-01-11
•
Expires: 1969-07-25
Abstract
No abstract record available.
Inventors
- 👤 Donald G Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375160A
Cited
US1833778A
Cited
US1805377A
Cited
US1775480A
Cited
US2001012A
Cited
US2040433A
Cited
US2555112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |