US4411945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction sheets
Assignee: Fujifilm Holdings Corp
•
Filing: 1981-03-24
•
Granted: 1983-10-25
•
Expires: 2001-03-24
Abstract
Abstract A friction sheet is described consisting of a single layer or a laminated layer comprising an at least uniaxially oriented high density polyethylene film having a density of at least 0.94 g/cm 3 .
Inventors
- 👤 Mutsuo Akao
- 👤 Haruo Furuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/18; B32B38/00; B32B38/0012; B32B7/00; B32B7/04; B32B7/12; G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08764; B32B2038/0028; B32B2038/0052; B32B2038/0092; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2307/70; B32B2307/746; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/043; B32B2429/00; B32B2429/02; Y; Y10; Y10S; Y10S264/00; Y10S264/73; Y10S428/00; Y10S428/90; Y10S428/906; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/256; Y10T428/30; Y10T428/31; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
63 words
A laminated friction sheet, comprising: a first layer of a uniaxially oriented high density polyethylene film having a density of at least 0.94 g/cm 3 ; a second layer of a uniaxially oriented high density polyethylene film having a density of at least 0.94 g/cm 3 , connected to the first layer by an adhesive layer positioned between said first and second layer.
Claim 2
Dependent Claim
63 words
A laminated friction sheet, comprising: a first layer of a uniaxially oriented high density polyethylene film having a density of at least 0.94 g/cm 3 ; a second layer of a uniaxially oriented high density polyethylene film having a density of at least 0.94 g/cm 3 , connected to the first layer by an adhesive layer positioned between said first and second layer.
Claim 3
Dependent Claim
22 words
A friction sheet as in claim 1 wherein said first and second high density polyethylene film is oriented uniaxially by a stretching.
Claim 4
Dependent Claim
22 words
A friction sheet as in claim 1 wherein said first and second high density polyethylene film is oriented biaxially by a stretching.
Claim 5
Dependent Claim
22 words
A friction sheet as in claim 1 wherein said first and second high density polyethylene film is oriented by a biaxial stretching.
Claim 6
Dependent Claim
18 words
A friction sheet as in claim 2 or 3 wherein the stretching rate is 1.5 to 20 times.
Claim 7
Dependent Claim
18 words
A friction sheet as in claim 2 or 3 wherein the stretching rate is 2.5 to 6 times.
Claim 8
Dependent Claim
24 words
A friction sheet as in any of claims 2, 3, 4 or 1 wherein the antistatic agents are incorporated into said high density polyethylene.
Claim 9
Dependent Claim
25 words
A friction sheet as in any of claims 2, 3, 4 or 1 wherrein silicone material or paraffin is incorporated into said high density polyethylene.
Claim 10
Dependent Claim
18 words
A friction sheet as in claim 1 wherein said high density polyethylene film is oriented by a stretching.
Claim 11
Dependent Claim
16 words
A friction sheet as in claim 1 wherein the adhesive layer comprises an ethylene-ethyl acrylate copolymer.
Claim 12
Dependent Claim
16 words
A friction sheet as in claim 1 wherein aluminum powder is incorporated into said adhesive layer.
Claim 13
Dependent Claim
33 words
A laminated friction sheet, as claimed in claim 1, wherein said first layer of uniaxially oriented film crosses said second layer of said uniaxially oriented film at an angle of 40° to 90°.
Claim 14
Dependent Claim
18 words
A laminated friction sheet, as claimed in claim 1, wherein aluminum paste is incorporated into said adhesive layer.
Claim 15
Dependent Claim
23 words
A laminated friction sheet, as claimed in claim 1, wherein said first and second layers have a thickness of about 30μ to 120μ;
Claim 16
Dependent Claim
17 words
A laminated friction sheet, as claimed in claim 14, wherein said thicknesses are about 50μ to 100μ.
Claim 17
Dependent Claim
30 words
A laminated friction sheet, as claimed in claim 1, further comprising a lubricant selected from the group consisting of silicone materials, paraffin, higher alcohols, aliphatic acids, or aliphatic acid salts.
Claim 18
Dependent Claim
36 words
A laminated friction sheet, as claimed in claim 1, further comprising a metal powder disposed in said polyethylene, wherein said metal powder is selected from the group consisting of aluminum powder, aluminum paste, or zinc powder.
Claim 19
Dependent Claim
23 words
A laminated friction sheet, as claimed in claim 1, wherein a surface of said first and second layers is made irregular or uneven.
Claim 20
Dependent Claim
21 words
A laminated friction sheet, as claimed in claim 1, further comprising: carbon black dispersed on the surface of said friction sheet.
Claim 21
Dependent Claim
55 words
A laminated friction sheet, comprising: a first flexible sheet layer; and a layer of a uniaxially oriented high density polyethylene film having a density of 0.94 g/cm 3 , connected to said first flexible sheet layer by an adhesive layer positioned between said first flexible sheet layer and said uniaxially oriented high density polyethylene film.
Claim 22
Dependent Claim
55 words
A laminated friction sheet, comprising: a first flexible sheet layer; and a layer of a uniaxially oriented high density polyethylene film having a density of 0.94 g/cm 3 , connected to said first flexible sheet layer by an adhesive layer positioned between said first flexible sheet layer and said uniaxially oriented high density polyethylene film.
Claim 23
Dependent Claim
51 words
A laminated friction sheet, as claimed in claim 20, further comprising: a second layer of a uniaxially oriented high density polyethylene film having a density of 0.94 g/cm 3 , connected to said first flexible sheet layer by an adhesive layer positioned between said first flexible sheet layer and said film.
Claim 24
Dependent Claim
51 words
A laminated friction sheet, as claimed in claim 20, further comprising: a second of a uniaxially oriented high density polyethylene film having a density of 0.94 g/cm 3 , connected to said first layer by a second adhesive layer positioned between said first layer and said second layer of polyethylene film.
Claim 25
Dependent Claim
24 words
A laminated friction sheet, as claimed in claim 20, further comprising: an aluminum vapor-deposited layer positioned on a surface of said flexible sheet layer.
Claim 26
Dependent Claim
30 words
A laminated friction sheet, as claimed in claim 20, further comprising an aluminum vapor-deposited layer positioned on a surface of said first layer of uniaxially oriented high density polyethylene film.
Claim 27
Dependent Claim
18 words
A friction sheet as in claim 20 wherein said high density polyethylene film is oriented by a stretching.
Claim 28
Dependent Claim
29 words
A friction sheet as in claim 20 wherein said flexible sheet layer comprises at least a material selected from an aluminum foil, paper, cellophane, polyethylene film and polypropylene film.
Claim 29
Dependent Claim
16 words
A friction sheet as in claim 20 wherein said adhesive layer comprises an ethylene-ethyl acrylate copolymer.
Claim 30
Dependent Claim
18 words
A friction sheet as in claim 20 wherein the antistatic agents are incorporated into said high density polyethylene.
References Cited (Backward Citations)
US3055784A
Cited
US3271229A
Cited
US3496061A
Cited
US3958064A
Cited
US3738904A
Cited
US4147291A
Cited
GB2060488A
Cited
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 |