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Patent US4476177A successfully refreshed from Google Patents.
US4476177A
Expired / Lapsed
US
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Magnetic tape having a leader tape
Assignee: Fujifilm Holdings Corp
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Filing: 1981-10-20
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Granted: 1984-10-09
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Expires: 2001-10-20
Abstract
Abstract A magnetic tape having on at least one end thereof a leader tape that comprises a base one or both sides of which are coated with a cleaning layer. The cleaning layer contains a binder and a particulate organic polymer having a size of 0.1 to 20 mu , and the leader tape has a light transmittance of 40 to 95%.
Inventors
- 👤 Chiaki Mizuno
- 👤 Goro Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/20; G11B23/26; G11B5/00; G11B5/41; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A tape comprising: a magnetic recording tape portion; and a leader tape portion connected at one end thereof, said leader tape comprising a base, and a cleaning layer coated on one side of said base, said cleaning layer consisting essentially of a binder and a particulate organic polymer having a size of 0.1 to 10μ, wherein said particulate organic polymer and said binder are mixed in a ratio of from 1/5 to 3/1 by weight, said leader tape portion having a light transmittance of 40 to 95%.
Claim 2
Dependent Claim
87 words
A tape comprising: a magnetic recording tape portion; and a leader tape portion connected at one end thereof, said leader tape comprising a base, and a cleaning layer coated on one side of said base, said cleaning layer consisting essentially of a binder and a particulate organic polymer having a size of 0.1 to 10μ, wherein said particulate organic polymer and said binder are mixed in a ratio of from 1/5 to 3/1 by weight, said leader tape portion having a light transmittance of 40 to 95%.
Claim 3
Dependent Claim
17 words
A tape as claimed in claim 1, wherein said ratio is from 1/3 to 1/1 by weight.
Claim 4
Dependent Claim
44 words
A tape as claimed in claim 1, wherein said binder and particulate organic polymer are spread in such a manner that particles of said organic polymer form islands each having a diameter of 5 to 20μ spaced by a distance of 5 to 20μ.
Claim 5
Dependent Claim
41 words
A tape as claimed in claim 1, where said particulate organic polymer is a cellulose powder, or resin particles selected from the group consisting of polystyrene, polyethylene, polypropylene, polyamide, polyester, phenolic resin, urea resin, melamine resin, epoxy resin or phenoxy resin.
Claim 6
Dependent Claim
24 words
A tape as claimed in claim 1, wherein said particulate organic polymers have a maximum size of 10μ and an average size of 2.5μ.
Claim 7
Dependent Claim
20 words
A tape as claimed in claim 1, wherein said cleaning layer is coated on both sides of said leader tape.
Claim 8
Dependent Claim
22 words
A tape as claimed in claim 1, wherein said leader tape is connected at both ends of said magnetic recording tape portion.
Claim 9
Dependent Claim
18 words
A tape as claimed in claim 1 wherein said base has a thickness ranging from 5 to 35μ.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |