Patent US2741141A successfully refreshed from Google Patents.
US2741141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalances
Assignee: Parkersburg Rig and Reel Co
•
Filing: 1951-04-19
•
Granted: 1956-04-10
•
Expires: 1971-04-19
Abstract
No abstract record available.
Inventors
- 👤 Mater Robert Griffin De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:14
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/14; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1956; Y10T74/19565; Y10T74/21; Y10T74/2142; Y10T74/2154; Y10T74/2156; Y10T74/2157
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US447607A
Cited
US1443685A
Cited
US1664524A
Cited
US1742552A
Cited
US1825610A
Cited
US2162663A
Cited
US2146690A
Cited
US2109033A
Cited
US2123676A
Cited
US2152702A
Cited
US2270843A
Cited
US2575075A
Cited
US2605950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |