US4138229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning tape for magnetic head
Assignee: Fujifilm Holdings Corp
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Filing: 1977-10-20
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Granted: 1979-02-06
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Expires: 1997-10-20
Abstract
Abstract A cleaning tape used for cleaning the surface of a magnetic recording head of a tape recorder or the like consists of a substrate and a cleaning layer. The cleaning layer contains two kinds of particles. One kind of particles has a small diameter and a high hardness, and the other has a large diameter and a low hardness.
Inventors
- 👤 Eiichi Tadokoro
- 👤 Masahiro Utumi
- 👤 Masaaki Fujiyama
- 👤 Satoru Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/41
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A cleaning tape for cleaning the surface of a magnetic recording head of a magnetic tape recorder or the like comprising a flexible substrate and a cleaning layer disposed thereon, said cleaning layer containing two kinds of particles one of which has a diameter of not more than 5μ and Mohs hardness of not less than 5.5, and the other of which has a diameter of 6 to 200μ and Mohs hardness of not more than 5.
Claim 2
Dependent Claim
77 words
A cleaning tape for cleaning the surface of a magnetic recording head of a magnetic tape recorder or the like comprising a flexible substrate and a cleaning layer disposed thereon, said cleaning layer containing two kinds of particles one of which has a diameter of not more than 5μ and Mohs hardness of not less than 5.5, and the other of which has a diameter of 6 to 200μ and Mohs hardness of not more than 5.
Claim 3
Dependent Claim
21 words
A cleaning tape as defined in claim 1 wherein the diameter of said one kind of particles is 0.1 to 1μ.
Claim 4
Dependent Claim
23 words
A cleaning tape as defined in claim 1 wherein the Mohs hardness of said one kind of particles is not less than 6.
Claim 5
Dependent Claim
21 words
A cleaning tape as defined in claim 1 wherein the diameter of said other kind of particles is 50 to 100μ.
Claim 6
Dependent Claim
23 words
A cleaning tape as defined in claim 1 wherein the Mohs hardness of said other kind of particles is not more than 4.
Claim 7
Dependent Claim
24 words
A cleaning tape as defined in claim 1 wherein said cleaning layer comprises a binder and said two kinds of particles are dispersed therein.
Claim 8
Dependent Claim
27 words
A cleaning tape as defined in claim 6 wherein the mixing weight ratio of said particles to the binder is within the range of 5:100 to 400:100.
Claim 9
Dependent Claim
27 words
A cleaning tape as defined in claim 7 wherein the mixing weight ratio of said particles to the binder is within the range of 50:100 to 200:100.
Claim 10
Dependent Claim
27 words
A cleaning tape as defined in claim 6 wherein the mixing weight ratio of said two kinds of particles is within the range of 1:100 to 100:1.
Claim 11
Dependent Claim
34 words
A cleaning tape as defined in claim 9 wherein the mixing weight ratio of said one kind of particles to said the other kind of particles is within the range of 1:100 to 1:10.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |