Patent US3641502A successfully refreshed from Google Patents.
US3641502A
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Data recording apparatus
Assignee: Fujitsu Services Ltd
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Filing: 1970-04-17
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Granted: 1972-02-08
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Expires: 1990-04-17
Abstract
Abstract A data recording apparatus includes two magnetic recording heads which are spaced apart along the length of an exchangeable magnetic recording tape. A switch normally connects an input data device to the first recording head such that data is recorded in a normal fashion. When it has become necessary to exchange a new tape for an old one, the incoming data is switched to a store where it is held as the tapes are exchanged. When a new tape is ready to record data, the switch is returned to its normal position such that data in the store is recorded by the second recording head concurrently with incoming data being recorded by the first recording head. The heads are spaced apart by a distance such that stored data recorded by the second recording head does not overlap incoming data recorded by the first head.
Inventors
- 👤 Cecil Thomas Whitehead
- 👤 Anthony Francis Ewar Critchley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:02
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B15/00; G11B15/18; G11B15/20; G11B27/00; G11B27/10; G11B5/00; G11B5/48; G11B5/488
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
Data recording apparatus for recording input data including an exchangeable recording medium, means for feeding the medium past spaced first and second recording means, a data store connected to the second recording means, means for applying the input data to the store during the period when a new recording medium is being exchanged for an old recording medium, and means for causing the stored data and input data to be recorded concurrently on the new medium by said second and first recording means, respectively, said data store being capable of storing all the input data which occurs during the period in which the medium is exchanged, and said recording means being spaced downstream of the first recording means by such a distance that the stored data is recorded without overlapping the recording of the input data.
Claim 2
Dependent Claim
136 words
Data recording apparatus for recording input data including an exchangeable recording medium, means for feeding the medium past spaced first and second recording means, a data store connected to the second recording means, means for applying the input data to the store during the period when a new recording medium is being exchanged for an old recording medium, and means for causing the stored data and input data to be recorded concurrently on the new medium by said second and first recording means, respectively, said data store being capable of storing all the input data which occurs during the period in which the medium is exchanged, and said recording means being spaced downstream of the first recording means by such a distance that the stored data is recorded without overlapping the recording of the input data.
Claim 3
Dependent Claim
33 words
An apparatus as claimed in claim 1 in which said means for normally applying data to said first recording means includes a data input device which produces timing signals over an output line.
Claim 4
Dependent Claim
60 words
An apparatus as claimed in claim 2 including means connected to said output to selectively apply said timing signals to a first input of said store to read out data for recording by the second recording device, and to a second input of the store to allow data to be written in the store during an exchange of recording media.
Claim 5
Dependent Claim
22 words
An apparatus as claimed in claim 1 in which the exchangeable recording is continuously moved past the first and second recording means.
Claim 6
Dependent Claim
23 words
An apparatus as claimed in claim 1 in which said exchangeable recording medium is incrementally moved past saiD first and second recording means.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |