Patent US5476708A successfully refreshed from Google Patents.
US5476708A
Expired / Lapsed
US
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Substrate for image-receiving sheet material
Assignee: Glory Mill Papers Ltd
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Filing: 1993-07-06
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Granted: 1995-12-19
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Expires: 2013-07-06
Abstract
Abstract Photographic base paper (10) has a face side waterproof coating which is a co-extruded layer structure of at least a pigmented core layer (P) and top surface layer (E) of polyethylene. The thickness of layer (E) is no more than 12 μm. The pigment content in the face side coating is at least 2 gm -2 and it is distributed such that the proportion by weight of pigment in the core layer is at least 1.75 times as great as the proportion by weight of pigment in the top surface layer. For optimum photodefinition (image sharpness) the top surface layer should be free of pigment, but as thin (1.5 to 3 μm) as possible. The pigment is preferably TiO 2 .
Inventors
- 👤 Roger J. Reed
- 👤 Paul Dunk
- 👤 Christopher Cusick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24934; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
128 words
A substrate for an imaging layer which is to carry an image to be viewed by reflected light, said substrate comprising: a base sheet with a wire side and a face side; and an opaque co-extruded polymeric coating on said face side, said face side coating comprising: i) a core layer bearing a particulate opacifying pigment; and ii) a top surface layer thereon having a thickness no greater than 12 μm and comprising low density polyethylene; iii) a total content of opacifying pigment in the face side coating of at least 3 gm -2 ; and iv) the top surface layer is devoid of pigment; wherein the co-extruded face side coating includes a lower layer on the face of the core layer remote from the top surface layer.
Claim 2
Dependent Claim
128 words
A substrate for an imaging layer which is to carry an image to be viewed by reflected light, said substrate comprising: a base sheet with a wire side and a face side; and an opaque co-extruded polymeric coating on said face side, said face side coating comprising: i) a core layer bearing a particulate opacifying pigment; and ii) a top surface layer thereon having a thickness no greater than 12 μm and comprising low density polyethylene; iii) a total content of opacifying pigment in the face side coating of at least 3 gm -2 ; and iv) the top surface layer is devoid of pigment; wherein the co-extruded face side coating includes a lower layer on the face of the core layer remote from the top surface layer.
Claim 3
Dependent Claim
21 words
A substrate as claimed in claim 1, wherein the thickness of the top surface layer is no grater than 8 μm.
Claim 4
Dependent Claim
21 words
A substrate as claimed in claim 2, wherein the thickness of the top surface layer is no grater than 5 μm.
Claim 5
Dependent Claim
26 words
A substrate as claimed in claim 3, wherein the thickness of the top surface layer is in a range of from 1.5 μm to 3.0 μm.
Claim 6
Dependent Claim
14 words
A substrate as claimed in claim 1, wherein the lower layer comprises a polyolefin.
Claim 7
Dependent Claim
13 words
A substrate as claimed in claim 5, wherein the lower layer comprises polyethylene.
Claim 8
Dependent Claim
26 words
A substrate as claimed in claim 1, wherein the lower layer carries some of the total content of the opacifying pigment in the face side coating.
Claim 9
Dependent Claim
30 words
A substrate as claimed in claim 7, wherein the total content of opacifying pigment in the face side coating is equal to or greater than about 10 gm -2 .
Claim 10
Dependent Claim
15 words
A substrate as claimed in claim 1 wherein the lower layer is devoid of pigment.
Claim 11
Dependent Claim
22 words
A substrate as claimed in claim 1, wherein the top surface layer comprises low density polyethylene other than linear low density polyethylene.
Claim 12
Dependent Claim
111 words
A substrate for an imaging layer which is to carry an image to be viewed by reflected light, said substrate comprising: a base sheet with a wire side and a face side; and an opaque co-extruded polymeric coating on said face side, said face side coating comprising: i) a bottom layer bearing a particulate opacifying pigment; and ii) a top surface layer thereon having a thickness no greater than 12 μm and comprising low density polyethylene other than linear low density polyethylene; iii) a total content of opacifying pigment in the face side coating of at least 3 gm -2 ; and iv) the top surface layer being devoid of pigment.
Claim 13
Dependent Claim
111 words
A substrate for an imaging layer which is to carry an image to be viewed by reflected light, said substrate comprising: a base sheet with a wire side and a face side; and an opaque co-extruded polymeric coating on said face side, said face side coating comprising: i) a bottom layer bearing a particulate opacifying pigment; and ii) a top surface layer thereon having a thickness no greater than 12 μm and comprising low density polyethylene other than linear low density polyethylene; iii) a total content of opacifying pigment in the face side coating of at least 3 gm -2 ; and iv) the top surface layer being devoid of pigment.
Claim 14
Dependent Claim
13 words
A substrate as claimed in claim 11, wherein the base sheet comprises paper.
Claim 15
Dependent Claim
14 words
A substrate as claimed in claim 12, wherein the paper is of photographic quality.
Claim 16
Dependent Claim
14 words
A substrate as claimed in claim 11, wherein the bottom layer comprises a polyolefin.
Claim 17
Dependent Claim
21 words
A substrate as claimed in claim 14, wherein the bottom layer comprises a blend of low density and high density polyethylene.
Claim 18
Dependent Claim
20 words
A substrate as claimed in claim 11, wherein at least a major proportion of the opacifying pigment is titanium dioxide.
Claim 19
Dependent Claim
49 words
A substrate as claimed in claim 11, wherein the total weight of the co-extruded face side coating is around 15 gm -2 , the total content of opacifying pigment in the said coating is around 3 gm -2 and the substrate is suitable for use as a phototypesetting paper.
Claim 20
Dependent Claim
51 words
A substrate as claimed in claim 11, wherein the total weight of the co-extruded face side coating is around 40 gm -2 , the total content of opacifying pigment in the said coating is around 7.5 -2 gm and the substrate is suitable for use as a monochrome photographic base paper.
Claim 21
Dependent Claim
51 words
A substrate as claimed in claim 11, wherein the total weight of the co-extruded face side coating is around 30 gm -2 , the total content of opacifying pigment in the said coating is around 5.5 gm -2 and the substrate is suitable for use as a colour photographic base paper.
Claim 22
Dependent Claim
33 words
A substrate as claimed in claim 11 wherein the total content of opacifying pigment in the face side coating is in the range of from 3 gm -2 to 10 gm -2 .
Claim 23
Dependent Claim
30 words
A substrate as claimed in claim 11 wherein the total content of opacifying pigment in the face side coating is equal to or greater than about 10 gm -2 .
Claim 24
Dependent Claim
21 words
A substrate as claimed in claim 11, wherein the thickness of the top surface layer is no greater than 8 μm.
Claim 25
Dependent Claim
21 words
A substrate as claimed in claim 22, wherein the thickness of the top surface layer is no greater than 5 μm.
Claim 26
Dependent Claim
26 words
A substrate as claimed in claim 23, wherein the thickness of the top surface layer is in the range of from 1.5 μm to 3.0 μm.
Claim 27
Dependent Claim
33 words
A substrate as claimed in claim 11, wherein the total content of opacifying pigment in the face side coating is in the range of from 3 gm -2 to 10 gm -2 .
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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) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |