Patent US3760123A successfully refreshed from Google Patents.
US3760123A
Expired / Lapsed
US
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Efficient direct contact transfer of long wavelength signals
Assignee: Individual
•
Filing: 1972-04-07
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Granted: 1973-09-18
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Expires: 1992-04-07
Abstract
Abstract A selected signal track on a master magnetic tape having other signal tracks is direct contact transferred to a copy tape. The portion of the copy tape in line with the selected signal track is magnetically biased by magnetic lines of force emanating from a high permeability magnetic structure. This structure is spaced from the copy tape a predetermined amount sufficient to prevent dispersal of the longest wavelength magnetic signals on the master tape but close enough to localize the magnetic bias on the copy tape for efficient signal transfer only of the selected signal track.
Inventors
- 👤 P Smaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
Apparatus for the contact transfer of a selected signal track containing audio signals of longest wavelength lambda l from a master magnetic storage medium having other signal tracks to a copy magnetic storage medium, said apparatus comprising: means for maintaining said master and copy storage mediums in substantially slippage-free contact; means for magnetically biasing said copy storage medium in line with said selected signal track during the contact transfer, said magnetic biasing means including a high permeability magnetic structure spaced from the copy storage medium at least 0.1 lambda l to prevent dispersal by said magnetic structure of the longest wavelength magnetic signals on said selected signal track and no more than 0.3 lambda l to localize the magnetic bias on said copy storage medium for efficient transfer only of said selected signal track.
Claim 2
Dependent Claim
134 words
Apparatus for the contact transfer of a selected signal track containing audio signals of longest wavelength lambda l from a master magnetic storage medium having other signal tracks to a copy magnetic storage medium, said apparatus comprising: means for maintaining said master and copy storage mediums in substantially slippage-free contact; means for magnetically biasing said copy storage medium in line with said selected signal track during the contact transfer, said magnetic biasing means including a high permeability magnetic structure spaced from the copy storage medium at least 0.1 lambda l to prevent dispersal by said magnetic structure of the longest wavelength magnetic signals on said selected signal track and no more than 0.3 lambda l to localize the magnetic bias on said copy storage medium for efficient transfer only of said selected signal track.
Claim 3
Dependent Claim
35 words
Apparatus as in claim 1 wherein the longest wavelength lambda l of said audio signals is approximately 40 mils and said magnetic structure is spaced between 4 mils and 12 mils from said copy tape.
Claim 4
Dependent Claim
66 words
Apparatus as in claim 1 wherein: said master and copy magnetic storage mediums comprise magnetic tapes; said selected siganl track extends in a direction parallel to the longitudinal edge of said tapes; and said other signal tracks are slanted with respect to the side edge of said tapes and terminate adjacent said selected signal track, said other signal tracks containing video signals having relatively short wavelengths.
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |