US3182298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic-recording head switch
Assignee: Bunker Ramo Corp
•
Filing: 1961-02-13
•
Granted: 1965-05-04
•
Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 John A Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:27
CPC Classifications
G; G11; G11B; G11B5/00; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A CONTROL CIRCUIT FOR A SYSTEM FOR RECORDING AND READING RECORDED ALTERNATING-CURRENT SIGNALS EMPLOYING A TRANSDUCER HAVING A COMMON CURRENT PATH FOR SAID ALTERNATING-CURRENT SIGNALS, SAID SYSTEM COMPRISING A SINGLE SEMICONDUCTOR SWITCHING DEVICE, MEANS CONNECTING SAID SEMICONDUCTOR SWITCHING DEVICE INTO SAID COMMON CURRENT PATH FOR SAID SIGNALS TO AND FROM SAID TRANSDUCER TO CONTROL THE CURRENT FLOW THEREIN, MEANS FOR BIASING SAID SEMICONDUCTOR SWITCHING DEVICE T BE NONCONDUCTIVE WHEN IT IS DESIRED TO MAINTAIN SAID TRANSDUCER INOPERATIVE MEANS FOR APPLYING A CURRENT DRIVE HAVING ONE LEVEL TO SAID SEMICONDUCTOR SWITCHING DEVICE WHEN IT IS DESIRED TO RECORD SIGNALS WITH SAID TRANSDUCER, AND MEANS FOR APPLYING A CURRENT DRIVE TO SAID SEMICONDUCTOR SWITCHING DEVICE HAVING ANOTHER LEVEL LESS THAN SAID ONE LEVEL WHEN IT IS DESIRED TO READ RECORDED SIGNALS WITH SAID TRANSDUCER.
Claim 2
Dependent Claim
132 words
A CONTROL CIRCUIT FOR A SYSTEM FOR RECORDING AND READING RECORDED ALTERNATING-CURRENT SIGNALS EMPLOYING A TRANSDUCER HAVING A COMMON CURRENT PATH FOR SAID ALTERNATING-CURRENT SIGNALS, SAID SYSTEM COMPRISING A SINGLE SEMICONDUCTOR SWITCHING DEVICE, MEANS CONNECTING SAID SEMICONDUCTOR SWITCHING DEVICE INTO SAID COMMON CURRENT PATH FOR SAID SIGNALS TO AND FROM SAID TRANSDUCER TO CONTROL THE CURRENT FLOW THEREIN, MEANS FOR BIASING SAID SEMICONDUCTOR SWITCHING DEVICE T BE NONCONDUCTIVE WHEN IT IS DESIRED TO MAINTAIN SAID TRANSDUCER INOPERATIVE MEANS FOR APPLYING A CURRENT DRIVE HAVING ONE LEVEL TO SAID SEMICONDUCTOR SWITCHING DEVICE WHEN IT IS DESIRED TO RECORD SIGNALS WITH SAID TRANSDUCER, AND MEANS FOR APPLYING A CURRENT DRIVE TO SAID SEMICONDUCTOR SWITCHING DEVICE HAVING ANOTHER LEVEL LESS THAN SAID ONE LEVEL WHEN IT IS DESIRED TO READ RECORDED SIGNALS WITH SAID TRANSDUCER.
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) | 1968-05-03 | 1968-11-02 | 1969-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-03 | 1972-11-02 | 1973-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-03 | 1976-11-02 | 1977-05-04 | $7700.00 | Window Closed / Lapsed |