US3424448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Springs and/or shock absorbers
Assignee: Individual
•
Filing: 1966-06-06
•
Granted: 1969-01-28
•
Expires: 1986-06-06
Abstract
No abstract record available.
Inventors
- 👤 Francis Tin Chak Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:01
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/30; F16F13/00; F16F13/04; F16F13/06; F16F9/003; F16F2234/00; F16F2234/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1029462A
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US2201912A
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US2350989A
Cited
US2320314A
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US2701714A
Cited
GB750522A
Cited
US2793031A
Cited
US3285596A
Cited
US3194355A
Cited
US3302940A
Cited
US3290037A
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 |