Patent US4752346A successfully refreshed from Google Patents.
US4752346A
Expired / Lapsed
US
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Apparatus and method for separating adherent films
Assignee: CNA Holdings LLC
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Filing: 1987-07-06
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Granted: 1988-06-21
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Expires: 2007-07-06
Abstract
Abstract An apparatus and method for separating adherent films using a platform with a grounded, electrically conductive surface capable of bearing a sheet material; and a grounded electrically conductive bar over the surface; and at least two pins for maintaining the position of the bar over the platform surface while permitting the passage of a sandwiched sheet material to be peeled apart, between said bar and said surface.
Inventors
- 👤 Stephan J. W. Platzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:32
CPC Classifications
B; B29; B29C; B29C63/00; B29C63/0004; B29C63/0013; Y; Y10; Y10S; Y10S156/00; Y10S156/934; Y10S156/935; Y10S156/937; Y10T; Y10T156/00; Y10T156/11; Y10T156/1153; Y10T156/1158; Y10T156/19
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
60 words
An apparatus for separating adherent films which comprises a platform having an electrically conductive surface capable of bearing a sheet material on said surface; and a grounded, electrically conductive bar positioned over said surface; and means for maintaining the position of said bar over said surface while permitting the passage of a sheet material between said bar and said surface.
Claim 2
Independent Claim
60 words
An apparatus for separating adherent films which comprises a platform having an electrically conductive surface capable of bearing a sheet material on said surface; and a grounded, electrically conductive bar positioned over said surface; and means for maintaining the position of said bar over said surface while permitting the passage of a sheet material between said bar and said surface.
Claim 3
Dependent Claim
11 words
The apparatus of claim 1 wherein said surface is substantially flat.
Claim 4
Dependent Claim
11 words
The apparatus of claim 1 wherein said bar is a wedge.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 wherein said wedge forms an angle with said surface of about 45° or less.
Claim 6
Dependent Claim
19 words
The apparatus of claim 3 wherein said wedge forms an angle with said surface of about 30° or less.
Claim 7
Dependent Claim
12 words
The apparatus of claim 3 wherein said electically conductive surface is grounded.
Claim 8
Dependent Claim
46 words
The apparatus of claim 1 wherein said means for maintaining the position of said bar over said surface comprises at least two pins mounted perpendicularly to said surface and extending through said bar wherein said bar is capable of motion along the direction of said pins.
Claim 9
Dependent Claim
21 words
The apparatus of claim 7 wherein said pins comprise screws capable of regulating the distance between said bar and said platform.
Claim 10
Dependent Claim
12 words
The apparatus of claim 7 further comprising springs positioned around said pins.
Claim 11
Independent Claim
106 words
An apparatus for separating adherent films which comprises a substantially flat platform having an electrically conductive surface capable of bearing a sheet material on said surface; and a grounded, electrically conductive wedge positioned over said surface wherein said wedge forms an angle with said surface of about 45° or less; and means for maintaining the position of said wedge over said surface while permitting the passage of a sheet material between said wedge and said surface, which means comprises at least two pins mounted perpendicularly to said surface and extending through said wedge wherein said wedge is capable of motion along the direction of said pins.
Claim 12
Independent Claim
106 words
An apparatus for separating adherent films which comprises a substantially flat platform having an electrically conductive surface capable of bearing a sheet material on said surface; and a grounded, electrically conductive wedge positioned over said surface wherein said wedge forms an angle with said surface of about 45° or less; and means for maintaining the position of said wedge over said surface while permitting the passage of a sheet material between said wedge and said surface, which means comprises at least two pins mounted perpendicularly to said surface and extending through said wedge wherein said wedge is capable of motion along the direction of said pins.
Claim 13
Dependent Claim
13 words
The apparatus of claim 10 wherein said angle is about 30° or less.
Claim 14
Dependent Claim
12 words
The apparatus of claim 10 wherein said electrically conductive surface is grounded.
Claim 15
Dependent Claim
20 words
The apparatus of claim 10 wherein said pins comprise screws and said apparatus further comprises springs positioned around said screws.
Claim 16
Independent Claim
48 words
A method for separating a flexible film from a surface which film is adhered to said surface with at least one adherent layer, which method comprises peeling said film from said surface and simultaneously grounding the static charge generated during said peeling step with electrically conductive grounding means.
Claim 17
Independent Claim
48 words
A method for separating a flexible film from a surface which film is adhered to said surface with at least one adherent layer, which method comprises peeling said film from said surface and simultaneously grounding the static charge generated during said peeling step with electrically conductive grounding means.
Claim 18
Dependent Claim
26 words
The method of claim 14 wherein said flexible film and said surface comprise materials selected from the group consisting of polyesters, aluminum, silicon, and cellulosic materials.
Claim 19
Dependent Claim
15 words
The method of claim 14 wherein said at least one adherent layer contains a colorant.
Claim 20
Dependent Claim
16 words
The method of claim 14 wherein said at least one adherent layer comprises a photosensitive composition.
Claim 21
Dependent Claim
16 words
The method of claim 14 wherein said at least one adherent layer comprises a thermal adhesive.
Claim 22
Dependent Claim
16 words
The method of claim 14 wherein said at least one adherent layer comprises a pressure-sensitive adhesive.
Claim 23
Dependent Claim
17 words
The method of claim 16 wherein said at least one adherent layer comprises a colored, photosensitive composition.
Claim 24
Dependent Claim
29 words
The method of claim 17 wherein said photosensitive composition comprises one or more compositions selected from the group consisting of photopolymerizable compositions, photohardenable compositions, o-quinone diazides and diazonium salts.
Claim 25
Dependent Claim
42 words
The method of claim 14 wherein said flexible film comprises a transparent polyester material, said at least one adherent layer comprises a colorant and a photosensitive composition selected from the group consisting of photopolymerizable compositions, photohardenable compositions, o-quinone diazides and diazonium salts.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |