US4567128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover sheet in a photosensitive element
Assignee: EIDP Inc
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Filing: 1984-07-23
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Granted: 1986-01-28
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Expires: 2004-07-23
Abstract
Abstract A photosensitive element containing a photosensitive composition sandwiched between a flexible support layer and a removable cover sheet, wherein the cover sheet has a roughened surface.
Inventors
- 👤 Allyn N. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:47
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/092; H; H05; H05K; H05K3/00; H05K3/0073; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
156 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a roughened finish on its surface which faces away from the photosensitive composition with the roughened finish having a peak to valley average distance of at least two microns.
Claim 2
Dependent Claim
156 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a roughened finish on its surface which faces away from the photosensitive composition with the roughened finish having a peak to valley average distance of at least two microns.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said element is unwound from a roll prior to lamination wherein the roughened finish allows air to be present between laps of the roll.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said peak to valley average difference is at least 4 microns.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said peak to valley difference is generally not greater than 10 microns.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said peak to valley difference is generally not greater than 40 microns.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the roughness is across the width of the element.
Claim 8
Dependent Claim
22 words
The method of claim 2 wherein the cover sheet or support allows diffusion of oxygen which retards autopolymerization of a photopolymerizable composition.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein the cover sheet allows oxygen diffusion.
Claim 10
Dependent Claim
26 words
The method of claim 2 wherein the roughened finish includes channels for air which allows movement of air into laps from the edge of the roll.
Claim 11
Dependent Claim
25 words
The method of claim 8 wherein the channels allow air to pass completely through laps from one edge of the roll to an opposite edge.
Claim 12
Dependent Claim
13 words
The method of claim 2 wherein the roughened finish is a texture finish.
Claim 13
Dependent Claim
13 words
The method of claim 2 wherein the roughened finish is a matte finish.
Claim 14
Dependent Claim
13 words
The method of claim 2 wherein the roughened finish is an embossed finish.
Claim 15
Dependent Claim
140 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a textured finish on its surface which faces away from the photosensitive composition.
Claim 16
Dependent Claim
140 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a textured finish on its surface which faces away from the photosensitive composition.
Claim 17
Dependent Claim
131 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a matte finish on its surface which faces away from the photosensitive composition.
Claim 18
Dependent Claim
131 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having a matte finish on its surface which faces away from the photosensitive composition.
Claim 19
Dependent Claim
140 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having an embossed finish on its surface which faces away from the photosensitive composition.
Claim 20
Dependent Claim
140 words
In a method of making a printed circuit board comprising the steps of: (i) laminating a supported photosensitive layer which is photopolymerizable to a surface, (ii) exposing imagewise the photosensitive layer to actinic radiation, (iii) removing an area of the layer, and (iv) modifying permanently by etching or plating a bared area of the surface; wherein prior to step (i) the supported photosensitive layer is present in a photosensitive element comprising a flexible support bearing at least one layer of a photosensitive composition and a removable cover sheet, said support having greater adhesion than the cover sheet to form the photosensitive element with the cover sheet being stripped from the photosensitive composition prior to laminating, whereby the improvement comprises the cover sheet in the photosensitive element having an embossed finish on its surface which faces away from the photosensitive composition.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |