US2659852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant speed motor drive system
Assignee: Dictaphone Corp
•
Filing: 1950-11-29
•
Granted: 1953-11-17
•
Expires: 1970-11-29
Abstract
No abstract record available.
Inventors
- 👤 John H Trevitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:47
CPC Classifications
H; H02; H02P; H02P4/00; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1600827A
Cited
US1957208A
Cited
US2134900A
Cited
US2295305A
Cited
US2490093A
Cited
US2505135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |