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 07:24
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
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References Cited (Backward Citations)
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US1443685A
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US1664524A
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US1742552A
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US1825610A
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US2162663A
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US2146690A
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US2109033A
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US2123676A
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US2152702A
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US2270843A
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US2575075A
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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 |