Patent US3315661A successfully refreshed from Google Patents.
US4411943A
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US
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Friction sheet
Assignee: Fujifilm Holdings Corp
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Filing: 1981-09-04
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Granted: 1983-10-25
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Expires: 2001-09-04
Abstract
Abstract A friction sheet comprising a flexible support which is embossed at one side, and at least one high density polyethylene film bonded onto the embossed surface of the flexible support. This friction sheet is suitable to be provided on an inner surface of a case which is subject to sliding contact with a tape roll accommodated in the case.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08764; B32B1/00; B32B27/00; B32B27/06; B32B27/18; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B32B2250/00; B32B2250/02; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/746; B32B2323/00; B32B2323/04; B32B2323/043; B32B2475/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A friction sheet for an inner surface of a case containing a tape roll and a friction sheet which is subject to sliding contact with a tape roll accommodated in the case, said friction sheet comprising a flexible support regularly embossed on the side thereof intended for contact with the tape roll and at least one uniaxially orientated high density polyethylene film composed mainly of a high density polyethylene having a density of at least 0.94 g/cm 3 bonded onto the embossed surface of the flexible support.
Claim 2
Dependent Claim
87 words
A friction sheet for an inner surface of a case containing a tape roll and a friction sheet which is subject to sliding contact with a tape roll accommodated in the case, said friction sheet comprising a flexible support regularly embossed on the side thereof intended for contact with the tape roll and at least one uniaxially orientated high density polyethylene film composed mainly of a high density polyethylene having a density of at least 0.94 g/cm 3 bonded onto the embossed surface of the flexible support.
Claim 3
Dependent Claim
32 words
A friction sheet as in claim 1, wherein the thickness of the flexible support is from about 10 to 200μ and the depth of the embossment is from about 3 to 100μ.
Claim 4
Dependent Claim
17 words
A friction sheet as in claim 2, wherein the depth of embossment is from 5 to 60μ.
Claim 5
Dependent Claim
17 words
A friction sheet as in claim 2, wherein the depth of embossment is from 10 to 50μ.
Claim 6
Dependent Claim
54 words
A friction sheet as in claim 1, 2, 3, or 4, wherein the high density polyethylene film is a cross-laminated film composed of two uniaxially oriented high density polyethylene films which are disposed so that the direction of orientation of the two high density polyethylene films form an angle of from 45° to 90°.
Claim 7
Dependent Claim
30 words
A friction sheet as in claim 1, 2, 3, or 4, wherein the flexible support and the high density polyethylene film are bonded together with an ethylene-ethyl acrylate copolymer resin.
Claim 8
Dependent Claim
26 words
A friction sheet as in claim 1, 2, 3, or 4, wherein the thickness of the high density polyethylene film is from about 10 to 200μ.
Claim 9
Dependent Claim
25 words
A friction sheet as in claim 1, 2, 3, or 4, wherein the thickness of the high density polyethylene film is from 20 to 70μ.
Claim 10
Dependent Claim
22 words
A friction sheet as in claim 5, wherein the thickness of each of the polyethylene films is from about 10 to 200μ.
Claim 11
Dependent Claim
22 words
A friction sheet as in claim 5, wherein the thickness of each of the polyethylene films is from 20 to 70 μ.
Claim 12
Dependent Claim
27 words
A friction sheet as in claim 1, wherein the surface active agents are incorporated into the high density polyethylene film, the adhesive layer, or the flexible support.
Claim 13
Dependent Claim
27 words
A friction sheet as in claim 5, wherein the surface active agents are incorporated into the high density polyethylene film, the adhesive layer, or the flexible support.
Claim 14
Dependent Claim
27 words
A friction sheet as in claim 6, wherein the surface active agents are incorporated into the high density polyethylene film, the adhesive layer, or the flexible support.
Claim 15
Dependent Claim
47 words
A friction sheet as in claim 1, 2, 3 or 4, wherein two high density polyethylene films are laminated on both surfaces of the flexible support so that the directions of orientation of the two high density polyethylene films form an angle of from 45° to 90°.
Claim 16
Dependent Claim
26 words
A friction sheet as in claim 1, 2, 3 or 4, wherein the flexible support is regularly embossed by an embossing roll or an embossing plate.
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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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |