US3424520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precession inhibitor
Assignee: Bell and Howell Co
•
Filing: 1965-10-24
•
Granted: 1969-01-28
•
Expires: 1985-10-24
Abstract
No abstract record available.
Inventors
- 👤 Daniel D Call
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:53
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/64; G03; G03B; G03B19/00; G03B19/18; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1402064A
Cited
US1586070A
Cited
US1586071A
Cited
US1634950A
Cited
US1860230A
Cited
US2457150A
Cited
US2423269A
Cited
US2829557A
Cited
US2959088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |