US3952117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of desensitizing
Assignee: Fujifilm Holdings Corp
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Filing: 1974-08-08
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Granted: 1976-04-20
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Expires: 1994-08-08
Abstract
Abstract A method of desensitizing a color developer used in a color forming reaction with a color former comprising contacting a desensitizer composition containing polypropylene glycol having an average molecular weight of about 400 to 5000 with the color developer.
Inventors
- 👤 Akio Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:14
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/128
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A method for desensitizing an electron accepting color developer compound used with a substantially colorless electron donor organic color former compound to produce a color forming reaction in a pressure-sensitive or heat-sensitive transfer system comprising contacting said color developer with a desensitizer comprising polypropylene glycol having an average molecular weight of from about 400 to 5,000.
Claim 2
Independent Claim
56 words
A method for desensitizing an electron accepting color developer compound used with a substantially colorless electron donor organic color former compound to produce a color forming reaction in a pressure-sensitive or heat-sensitive transfer system comprising contacting said color developer with a desensitizer comprising polypropylene glycol having an average molecular weight of from about 400 to 5,000.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein said polypropylene glycol has an average molecular weight of about 1000 to 3000.
Claim 4
Dependent Claim
35 words
The method in claim 1, wherein the desensitizer composition comprises a binder, polypropylene glycol having an average molecular weight of about 400 to 5000, and at least one of a pigment and an organic solvent.
Claim 5
Dependent Claim
20 words
The method of claim 3, wherein the polypropylene glycol comprises about 5 to 60% by weight of the desensitizer composition.
Claim 6
Dependent Claim
13 words
The method of claim 3, wherein the desensitizer composition includes a polyoxyethylene alkylamine.
Claim 7
Dependent Claim
30 words
The method of claim 1, wherein the color developer is coated on a support and said contacting is by applying said desensitizer composition to said color developer on said support.
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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |