US2949979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety brake
Assignee: Duff Norton Co Inc
•
Filing: 1958-03-03
•
Granted: 1960-08-23
•
Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Carroll Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:59
CPC Classifications
B; B66; B66D; B66D5/00; B66D2700/00; B66D2700/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US785295A
Cited
GB190511038A
Cited
FR721683A
Cited
DE627991C
Cited
US2044070A
Cited
US2233798A
Cited
US2285134A
Cited
US2696365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |