Patent US2772931A successfully refreshed from Google Patents.
US2772931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston for reciprocating pumps
Assignee: Individual
•
Filing: 1953-11-06
•
Granted: 1956-12-04
•
Expires: 1973-11-06
Abstract
No abstract record available.
Inventors
- 👤 Paul R G Biedermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:02
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/005; F16J1/006; F16J1/008; F04; F04B; F04B53/00; F04B53/14; F04B53/143
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1739385A
Cited
US1358629A
Cited
US1531242A
Cited
US1757460A
Cited
US1840880A
Cited
US2019757A
Cited
US2142624A
Cited
US2157039A
Cited
US2318757A
Cited
US2411229A
Cited
US2596703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |