Patent US3931643A successfully refreshed from Google Patents.
US3931643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head cleaning tape cartridge for use in magnetic recording and reproducing apparatus of the rotary head type
Assignee: Panasonic Holdings Corp
•
Filing: 1974-04-08
•
Granted: 1976-01-06
•
Expires: 1994-04-08
Abstract
Abstract A magnetic head cleaning tape cartridge is disclosed which comprises a length of cleaning tape assembly consisting of a transparent and relatively rigid leader tape, a cleaning tape which has a layer made of fibrous materials for intimate contact with the surface of a magnetic head and has a lower transmissivity than the leader tape, and a transparent trailer tape; a supply reel around which is wrapped the cleaning tape assembly; and a cartridge case containing the reel.
Inventors
- 👤 Akio Kuroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:24
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/67; G11B5/00; G11B5/41
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
In a magnetic recording-reproducing apparatus of a rotary having automatic threading means and automatic rewinding means in which winding of a tape is stopped before initiating the rewinding operation, a magnetic head cleaning tape cartridge, comprising: a. a leader tape of high light transmissivity; b. a cleaning tape connected to said leader tape and made of fibrous material, said cleaning tape having less light transmissivity than said leader tape; c. a polishing tape connected to said cleaning tape and including an abrasive material which is less abrasive than said fibrous material, said polishing tape having less light transmissivity than said leader tape; d. a trailer tape of high light transmissivity connected to said polishing tape; e. a single reel around which is wound a composite tape including said leader, cleaning, polishing and trailer tapes; and f. a cartridge case rotatably housing said single reel therein; g. the length of said leader, cleaning, polishing, and trailer tapes being such that said polishing tape is located on the rotary head when said composite tape is stopped before initiating the rewinding operation.
Claim 2
Dependent Claim
179 words
In a magnetic recording-reproducing apparatus of a rotary having automatic threading means and automatic rewinding means in which winding of a tape is stopped before initiating the rewinding operation, a magnetic head cleaning tape cartridge, comprising: a. a leader tape of high light transmissivity; b. a cleaning tape connected to said leader tape and made of fibrous material, said cleaning tape having less light transmissivity than said leader tape; c. a polishing tape connected to said cleaning tape and including an abrasive material which is less abrasive than said fibrous material, said polishing tape having less light transmissivity than said leader tape; d. a trailer tape of high light transmissivity connected to said polishing tape; e. a single reel around which is wound a composite tape including said leader, cleaning, polishing and trailer tapes; and f. a cartridge case rotatably housing said single reel therein; g. the length of said leader, cleaning, polishing, and trailer tapes being such that said polishing tape is located on the rotary head when said composite tape is stopped before initiating the rewinding operation.
Claim 3
Dependent Claim
34 words
A magnetic head cleaning tape cartridge as defined in claim 1 wherein said cleaning tape further comprises a thin-film tape, made of organic compounds, on one side of which said fibrous material is bonded.
Claim 4
Dependent Claim
40 words
A magnetic head cleaning tape cartridge as defined in claim 2 wherein said cleaning tape further comprises an adhesive, mixed with a substance of less light transmissivity than said leader tape, which bonds said fibrous material to said thin-film tape.
Claim 5
Dependent Claim
36 words
A magnetic head cleaning tape cartridge as defined in claim 2 wherein said cleaning tape further comprises a layer of less light transmissivity than said leader tape connected to the other side of said thin-film tape.
Claim 6
Dependent Claim
23 words
A magnetic head cleaning tape cartridge as defined in claim 1 wherein said polishing tape comprises a magnetic tape having prerecorded video signals.
Claim 7
Dependent Claim
21 words
A magnetic head cleaning tape cartridge as defined in claim 1 wherein the fibrous material of said cleaning tape is silk.
Claim 8
Dependent Claim
21 words
A magnetic head cleaning tape cartridge as defined in claim 1 wherein the fibrous material of said cleaning tape is hemp.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |