US3489258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsating fall retarder
Assignee: United States Steel Corp
•
Filing: 1968-04-29
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Granted: 1970-01-13
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Expires: 1988-04-29
Abstract
No abstract record available.
Inventors
- 👤 William H Stokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:49
CPC Classifications
B; B65; B65G; B65G11/00; B65G11/20; B65G11/206; B65G69/00; B65G69/16; B65G2201/00; B65G2201/02; B65G2201/0202; B65G2201/0211; B65G2814/00; B65G2814/02; B65G2814/0205; B65G2814/0211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2647670A
Cited
DE1052898B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |