US3214178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record carrier
Assignee: Telefunken AG
•
Filing: 1960-09-26
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Granted: 1965-10-26
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Egon Fred Warnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B3/00; G11B3/68; G11B3/70; G11B5/62; G11B5/64; G11B5/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A SHEET-TYPE MAGNETIC RECORD CARRIER FOR USE WITH MAGNETIC RECORDING APPARATUS HAVING A REPRODUCING HEAD, SAID CARRIER HAVING A MAGNETIC LAYER AND BEING PROVIDED WITH A RECORDING GROOVE COMMENCING WITH A STARTING PORTION OF A PITCH DIFFERENT FROM THAT OF THE REMAINDER OF THE GROOVE, THE BOTTOM OF SAID STARTING PORTION BEING FORMED, AT LEAST AT THE POINT OF SAID STARTING PORTION BEING IS CLOSEST TO THE REMAINDER OF SAID GROOVE, WITH A SERIES OF RECESSES TRANSVERSE TO THE DIRECTION OF SAID GROOVE, SAID RECESSES HAVING A WIDTH WHICH IS GENERALLY OF THE SAME ORDER OF MAGNITUDE AS THE DISTANCE WHICH CONSECUTIVE RECESSES ARE SPACED FROM EACH OTHER TO PROVIDE AN AIR GAP MEANS OF VARYING SIZE FOR INDUCING AN AUDIO VOLTAGE IN THE REPRODUCING HEAD OF THE RECORDING CARRIER BY A D.C. AFTER A PRECEDING ERASING OF SAID RECORD CARRIER BY A D.C. FIELD, SUCH HEAD SCANS SAID STARTING PORTION, SAID AUDIO VOLTAGE BEING SUITED FOR PRODUCING AN AUDIO SIGNAL.
Claim 2
Dependent Claim
161 words
A SHEET-TYPE MAGNETIC RECORD CARRIER FOR USE WITH MAGNETIC RECORDING APPARATUS HAVING A REPRODUCING HEAD, SAID CARRIER HAVING A MAGNETIC LAYER AND BEING PROVIDED WITH A RECORDING GROOVE COMMENCING WITH A STARTING PORTION OF A PITCH DIFFERENT FROM THAT OF THE REMAINDER OF THE GROOVE, THE BOTTOM OF SAID STARTING PORTION BEING FORMED, AT LEAST AT THE POINT OF SAID STARTING PORTION BEING IS CLOSEST TO THE REMAINDER OF SAID GROOVE, WITH A SERIES OF RECESSES TRANSVERSE TO THE DIRECTION OF SAID GROOVE, SAID RECESSES HAVING A WIDTH WHICH IS GENERALLY OF THE SAME ORDER OF MAGNITUDE AS THE DISTANCE WHICH CONSECUTIVE RECESSES ARE SPACED FROM EACH OTHER TO PROVIDE AN AIR GAP MEANS OF VARYING SIZE FOR INDUCING AN AUDIO VOLTAGE IN THE REPRODUCING HEAD OF THE RECORDING CARRIER BY A D.C. AFTER A PRECEDING ERASING OF SAID RECORD CARRIER BY A D.C. FIELD, SUCH HEAD SCANS SAID STARTING PORTION, SAID AUDIO VOLTAGE BEING SUITED FOR PRODUCING AN AUDIO SIGNAL.
References Cited (Backward Citations)
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US956727A
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US1372822A
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US2493755A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |