US4216299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color developer for pressure-sensitive copying paper
Assignee: Sumitomo Durez Co Ltd
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Filing: 1977-11-01
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Granted: 1980-08-05
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Expires: 1997-11-01
Abstract
Abstract A color developer for pressure-sensitive copying paper is prepared by mixing a polyvalent metal salt of a para-substituted difunctional phenol-aldehyde condensate and a tri- or higher-functional phenol-aldehyde condensate and/or a polyvalent metal modified tri- or higher-functional phenol-aldehyde condensate.
Inventors
- 👤 Toyoji Kikuga
- 👤 Koji Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:01
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; C08L; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A color developer for pressure-sensitive copying paper which comprises: (1) a polyvalent metal salt of a co-condensate obtained by condensation with an aldehyde of at least one p-substituted difunctional phenol, wherein the p-substituent of said phenol is an alkyl group of 1 to 12 carbon atoms, and a tri- or higher functional phenol in an amount not exceeding about 0.6 moles with respect to 1 mole of said p-substituted difunctional phenol and (2) a tri- or higher-functional phenol-aldehyde condensate, a polyvalent metal-modified product thereof, or a mixture of said condensate and said metal-modified product.
Claim 2
Dependent Claim
94 words
A color developer for pressure-sensitive copying paper which comprises: (1) a polyvalent metal salt of a co-condensate obtained by condensation with an aldehyde of at least one p-substituted difunctional phenol, wherein the p-substituent of said phenol is an alkyl group of 1 to 12 carbon atoms, and a tri- or higher functional phenol in an amount not exceeding about 0.6 moles with respect to 1 mole of said p-substituted difunctional phenol and (2) a tri- or higher-functional phenol-aldehyde condensate, a polyvalent metal-modified product thereof, or a mixture of said condensate and said metal-modified product.
Claim 3
Dependent Claim
29 words
A color developer for pressure-sensitive copying paper according to claim 1 wherein said polyvalent metal salt of p-substituted difunctional phenol-aldehyde condensate is a salt of zinc, calcium or aluminum.
Claim 4
Dependent Claim
37 words
A color developer for pressure-sensitive copying paper according to claim 2 wherein said polyvalent metal salt of p-substituted difunctional phenol-aldehyde condensate is provided with a metal content within a range from about 1 to 10 weight percent.
Claim 5
Dependent Claim
22 words
A color developer for pressure-sensitive copying paper according to claim 1 wherein the p-substituted difunctional phenol contains a branched chain p-alkyl substituent.
Claim 6
Dependent Claim
19 words
A color developer for pressure-sensitive copying paper according to claim 4 wherein the p-substituted difunctional phenol is p-tert-butyl phenol.
Claim 7
Dependent Claim
19 words
A color developer for pressure-sensitive copying paper according to claim 4 wherein the p-substituted difunctional phenol is p-tert-octyl phenol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |