US2681013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for maintaining air cushions in pumps
Assignee: Individual
•
Filing: 1950-07-14
•
Granted: 1954-06-15
•
Expires: 1970-07-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest B Ogdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
F; F04; F04B; F04B11/00; F04B11/0008; F04B11/0016; F04B11/0025; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |