US3141530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential forcing apparatus
Assignee: North American Aviation Corp
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Filing: 1961-05-01
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Granted: 1964-07-21
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Robert I Morley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:02
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/22; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/20588
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
IN A TAPE READER MECHANISM, A BRAKE-DRIVE MEANS FOR ALTERNATELY STOPPING AND RELEASING A TAPE, COMPRISING: A BRAKE SOLENOID, A CONTROL CIRCUIT RESPONSIVE TO AN INPUT SIGNAL FOR ENERGIZING SAID SOLENOID TO EFFECT EXERTION OF A QUIESCENT FORCE, SAID SOLENOID BEING RESPONSIVELY CONNECTED TO SAID CONTROL CIRCUIT, A ROTATABLY MOUNTED MECHANICAL BRAKE ARM OF MAGNETICALLY PERMEABLE MATERIAL, SAID BRAKE ARM AND BRAKE SOLENOID COOPERATING IN SAID MAGNETIC CIRCUIT TO ACHIEVE A BRAKING MOMENT ABOUT SAID PIVOT, SECOND MEANS FOR REDUCING THE EFFECT OF THE ELECTRICAL TIME CONSTANT OF SAID BRAKE SOLENOID, AND THIRD MEANS FOR REDUCING THE EFFECT OF THE MECHANICAL TIME CONSTANT OF SAID BRAKE ARM.
References Cited (Backward Citations)
US2437756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |