US4784692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-developing agent for pressure-sensitive recording sheet and color-developing sheet thereof
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1987-11-18
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Granted: 1988-11-15
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Expires: 2007-11-18
Abstract
Abstract The color-developing agent for pressure-sensitive recording sheet comprises a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound. The color-developing sheet containing the above color-developing agent provides an excellent color-developing rate and an improved light fastness.
Inventors
- 👤 Hiroaki Umeda
- 👤 Mamoru Suzuki
- 👤 Akira Hasegawa
- 👤 Kunio Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
A color-developing agent for pressure-sensitive recording sheet which comprises a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.
Claim 2
Dependent Claim
23 words
A color-developing agent for pressure-sensitive recording sheet which comprises a reaction product of carboxylated terpenephenol resin, aromatic carboxylic acid and polyvalent metal compound.
Claim 3
Dependent Claim
27 words
The color-developing agent according to claim 1, wherein said aromatic carboxylic acid is used an amount of 5-50 molar % equivalent, based on said carboxylated terpenephenol resin.
Claim 4
Dependent Claim
16 words
The color-developing agent according to claim 1, wherein said aromatic carboxylic acid is aromatic monocarboxylic acid.
Claim 5
Dependent Claim
47 words
The color-developing agent according to claim 1, wherein said polyvalent metal compound is at least one substance selected from the group consisting of oxides, halides, carbonates, sulfates, nitrates, acetates, formates, oxalates, benzoates, acethylacetonates and salicylates of magnesium, aluminium, cadmium, calcium, titanium, zinc, nickel, cobalt, manganese and vanadium.
Claim 6
Dependent Claim
26 words
The color-developing agent according to claim 1, wherein said polyvalent metal is at least one member selected from the group consisting of magnesium, aluminum and zinc.
Claim 7
Dependent Claim
13 words
The color-developing agent according to claim 1, wherein said polyvalent metal is zinc.
References Cited (Backward Citations)
US4749680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |