Patent US3439561A successfully refreshed from Google Patents.
US3439561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical torque converter
Assignee: Individual
•
Filing: 1968-04-12
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Granted: 1969-04-22
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Expires: 1988-04-12
Abstract
No abstract record available.
Inventors
- 👤 Martin Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
F; F16; F16H; F16H33/00; F16H33/02; F16H33/04; F16H33/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |