Patent US4179538A successfully refreshed from Google Patents.
US4179538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of eliminating cracking in the coating of TiO2 layers
Assignee: Eastman Kodak Co
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Filing: 1977-09-06
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Granted: 1979-12-18
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Expires: 1997-09-06
Abstract
Abstract A process for eliminating cracking in a titanium dioxide-hydroxyethylcellulose layer by simultaneously coating thereover a hydrophilic colloid layer such as gelatin.
Inventors
- 👤 Herbert R. Sassenhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:30
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C1/00; G03C1/76; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/136; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31768; Y10T428/31786; Y10T428/3179; Y10T428/31855; Y10T428/3188; Y10T428/31884
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
In a process of coating a layer comprising a titanium dioxide pigment and a hydroxyethylcellulose binder on a water-absorbent layer carried by a support wherein the ratio of titanium dioxide to hydroxyethylcellulose is such that said titanium dioxide layer has a propensity to crack during said coating, the improvement wherein during said coating of said titanium dioxide layer, a hydrophilic colloid layer is simultaneously coated thereover, thereby eliminating the propensity of said titanium dioxide layer to crack.
Claim 2
Dependent Claim
77 words
In a process of coating a layer comprising a titanium dioxide pigment and a hydroxyethylcellulose binder on a water-absorbent layer carried by a support wherein the ratio of titanium dioxide to hydroxyethylcellulose is such that said titanium dioxide layer has a propensity to crack during said coating, the improvement wherein during said coating of said titanium dioxide layer, a hydrophilic colloid layer is simultaneously coated thereover, thereby eliminating the propensity of said titanium dioxide layer to crack.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the ratio of titanium dioxide to hydroxyethylcellulose is 10:1 to 80:1 by weight.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the ratio of titanium dioxide to hydroxyethylcellulose is 40:1 by weight.
Claim 5
Dependent Claim
8 words
The product of the process of claim 2.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein said water-absorbent layer is a 2:1 mixture of polyvinyl alcohol and poly-4-vinyl pyridine.
Claim 7
Dependent Claim
8 words
The product of the process of claim 5.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said hydrophilic colloid layer is gelatin.
Claim 9
Dependent Claim
8 words
The product of the process of claim 7.
Claim 10
Dependent Claim
8 words
The product of the process of claim 1.
Claim 11
Dependent Claim
106 words
In a process of coating a support with the following layers in sequence: (a) a polymeric acid layer comprising the partial butyl ester of polyethylene/maleic anhydride copolymer; (b) a polymeric spacer layer comprising hydroxypropylcellulose; (c) a polymeric image-receiving layer comprising a 2:1 mixture of polyvinyl alcohol and poly-4-vinyl pyridine; and (d) a layer of titanium dioxide and hydroxyethylcellulose in a ratio of 40:1, by weight, said titanium dioxide layer having a propensity to crack during said coating, the improvement wherein during said coating of said titanium dioxide layer, a gelatin layer is simultaneously coated thereover, thereby eliminating the propensity of said titanium dioxide layer to crack.
Claim 12
Dependent Claim
106 words
In a process of coating a support with the following layers in sequence: (a) a polymeric acid layer comprising the partial butyl ester of polyethylene/maleic anhydride copolymer; (b) a polymeric spacer layer comprising hydroxypropylcellulose; (c) a polymeric image-receiving layer comprising a 2:1 mixture of polyvinyl alcohol and poly-4-vinyl pyridine; and (d) a layer of titanium dioxide and hydroxyethylcellulose in a ratio of 40:1, by weight, said titanium dioxide layer having a propensity to crack during said coating, the improvement wherein during said coating of said titanium dioxide layer, a gelatin layer is simultaneously coated thereover, thereby eliminating the propensity of said titanium dioxide layer to crack.
Claim 13
Dependent Claim
8 words
The product of the process of claim 10.
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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) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |