US4448622A
Expired / Lapsed
US
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Composite polymeric film and method for its use in installing a very thin polymeric film in a device
Assignee: United States Department of Energy
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Filing: 1982-04-26
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Granted: 1984-05-15
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Expires: 2002-04-26
Abstract
Abstract A composite polymeric film and a method for its use in forming and installing a very thin (<10 μm) polymeric film are disclosed. The composite film consists of a thin film layer and a backing layer. The backing layer is soluble in a solvent in which the thin film layer is not soluble. In accordance with the method, the composite film is installed in a device in the same position in which it is sought to finally emplace the thin film. The backing layer is then selectively dissolved in the solvent to leave the insoluble thin film layer as an unbacked film. The method permits a very thin film to be successfully installed in devices where the fragility of the film would preclude handling and installation by conventional methods.
Inventors
- 👤 David V. Duchane
- 👤 Barry L. Barthell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/06; B32B27/08; B32B27/18; B32B27/22; B32B27/306; C; C08; C08J; C08J5/00; C08J5/18; C08J7/00; C08J7/04; C08J7/0427; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31866; Y10T428/3188; Y10T428/31884; Y10T428/31909; Y10T428/31928; Y10T428/31942; Y10T428/31949; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
68 words
A composite polymeric film for use in installing a very thin polymeric film in a device, comprising a water soluble backing layer selected from the group consisting of polyvinyl alcohol, cellulose ether, sodium carboxymethyl cellulose and polyoxyethylene, and a thin film layer selected from the group consisting of polyvinyl formal, polymeric di-p-xylylene and cellulose acetate, and wherein said backing layer is relatively thicker than said thin film layer.
Claim 2
Dependent Claim
68 words
A composite polymeric film for use in installing a very thin polymeric film in a device, comprising a water soluble backing layer selected from the group consisting of polyvinyl alcohol, cellulose ether, sodium carboxymethyl cellulose and polyoxyethylene, and a thin film layer selected from the group consisting of polyvinyl formal, polymeric di-p-xylylene and cellulose acetate, and wherein said backing layer is relatively thicker than said thin film layer.
Claim 3
Dependent Claim
19 words
The composite polymeric film defined in claim 1 wherein said polyvinyl alcohol is between 75 and 95 percent hydrolyzed.
Claim 4
Dependent Claim
16 words
The composite polymeric film defined in claim 2 wherein said backing layer further includes a plasticizer.
Claim 5
Dependent Claim
14 words
The composite polymeric film defined in claim 3 wherein said plasticizer consists of glycerin.
Claim 6
Independent Claim
112 words
A method of installing a thin polymeric film in a device, comprising the steps of: forming a composite film consisting essentially of a backing layer and a thin film layer, said backing layer being relative thicker than said thin film layer, said backing layer being soluble in at least one solvent in which said thin film layer is insoluble; installing said composite film in a device in a position in which it is desired to install said thin film; and immersing said device together with said composite film in a suitable solvent to dissolve said backing layer and leave said film layer as an unbacked thin polymeric film installed in the device.
Claim 7
Independent Claim
112 words
A method of installing a thin polymeric film in a device, comprising the steps of: forming a composite film consisting essentially of a backing layer and a thin film layer, said backing layer being relative thicker than said thin film layer, said backing layer being soluble in at least one solvent in which said thin film layer is insoluble; installing said composite film in a device in a position in which it is desired to install said thin film; and immersing said device together with said composite film in a suitable solvent to dissolve said backing layer and leave said film layer as an unbacked thin polymeric film installed in the device.
Claim 8
Dependent Claim
15 words
The method of claim 5 wherein said thin film layer consists essentially of polyvinyl formal.
Claim 9
Dependent Claim
14 words
The method of claim 6 wherein said backing layer consists essentially of polyvinyl alcohol.
Claim 10
Dependent Claim
22 words
The method of claim 7 wherein said backing layer consists essentially of polyvinyl alcohol which is between 75 and 95 percent hydrolyzed.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein said backing layer further includes a plasticizer.
Claim 12
Dependent Claim
10 words
The method of claim 9 wherein said plasticizer is glycerin.
Claim 13
Dependent Claim
14 words
The method of claim 5 wherein said thin film layer consists essentially of di-p-xylylene.
Claim 14
Dependent Claim
14 words
The method of claim 5 wherein said film layer consists essentially of cellulose acetate.
Claim 15
Dependent Claim
16 words
The method of claim 11 or 12 wherein said backing layer consists essentially of polyvinyl alcohol.
Claim 16
Dependent Claim
16 words
The methods of claim 13 wherein said polyvinyl alcohol is between 75 and 95 percent hydrolyzed.
References Cited (Backward Citations)
US3505264A
Cited
US3484409A
Cited
US3859125A
Cited
US4119604A
Cited
US4372311A
Cited
US4379805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |