Patent DE106791C successfully refreshed from Google Patents.
Patent US3555390A successfully refreshed from Google Patents.
US3555390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit for motor control in slide scanning systems
Assignee: GTE Sylvania Inc
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Filing: 1968-10-07
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Granted: 1971-01-12
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Expires: 1988-10-07
Abstract
Abstract A MOTOR DRIVE FOR A SLIDE CHANGING MECHANISM IN A SLIDE PROJECTOR IS PROVIDED IN WHICH THE MOTOR IS IDLE EXCEPT WHEN ACTUALLY REQUIRED TO EFFECT A CHANGE IN SLIDES.
Inventors
- 👤 Robert J Peffer
- 👤 George C Waybright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:41
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |