US2981575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating pump cylinder head and liner retainer
Assignee: Southwest Oilfield Products Inc
•
Filing: 1959-04-24
•
Granted: 1961-04-25
•
Expires: 1979-04-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Leman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:34
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/02; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/166; F04B53/168
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2732809A
Cited
US2384386A
Cited
US2584518A
Cited
US2537249A
Cited
US2584100A
Cited
US2757056A
Cited
US2717186A
Cited
US2856249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |