Patent US3420072A successfully refreshed from Google Patents.
US3420072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission system
Assignee: Boeing Co
•
Filing: 1967-01-05
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Granted: 1969-01-07
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Expires: 1987-01-05
Abstract
No abstract record available.
Inventors
- 👤 Robert J Baier
- 👤 John C Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:25
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/10; F16F9/103; F16F15/00; F16F15/02; F16F15/023; F16F15/10; F16F9/32; F16F9/50; F16F9/52; Y; Y10; Y10S; Y10S464/00; Y10S464/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1807798A
Cited
US830749A
Cited
US1918249A
Cited
US2013109A
Cited
US1961679A
Cited
US2331160A
Cited
US2346432A
Cited
US2889695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |