Patent US3773508A successfully refreshed from Google Patents.
US3773508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imagewise exposing and heating a photosensitive composition containing a spiropyran compound and an organic peroxide
Assignee: Fujifilm Holdings Corp
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Filing: 1971-11-16
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Granted: 1973-11-20
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Expires: 1991-11-16
Abstract
Abstract Permanent photochromic images are obtained by selectively exposing a photochromic compound and an organic peroxide in a resin binder to ultraviolet radiation and thereafter heating the element whereby a reaction occurs in the exposed areas to provide the permenent images.
Inventors
- 👤 C Osada
- 👤 H Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:10
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/685; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
25 words
The process of claim 1 wherein said organic peroxide is selected from the group consisting of diacyl peroxides, dialkyl peroxides, hydroperoxide, ketone peroxides and peroxyesters.
Claim 2
Dependent Claim
56 words
The process of claim 1 wherein said high molecular weight resin binder is a synthetic high molecular weight compounds suluble in organic solvents is selected from the group consisting of polyvinyl acetate, polystyrene, polyvinyl chloride, polymethylmethacrylate, polyethylmethacrylate, polymethylacrylate, copolymers of the monomers of the above compounds, cellulose acetate, cellulose butyrate acetate, polyvinyl butyral and polyvinyl acetal.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the organic peroxide is benzoyl peroxide.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the amount of photochromic compound is 2 to 5 percent and the amount of organic peroxide is about 10 percent.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said heating is to about 70* to about 90*C.
Claim 6
Dependent Claim
17 words
The process of claim 6 wherein said heating is for from about 5 to about 10 seconds.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the peroxide decomposes at 70* to 130*C.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the binder has a molecular weight of about 10,000 to about 70,000.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein m is 2, and both Y groups are bromine.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein m is 2, and one Y group is NO2 and the other is OCH3.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein m is 1 and Y is NO2.
Claim 12
Dependent Claim
53 words
The process of claim 1 wherein all lower alkyl groups have 1 - 5 carbon atoms, the substituted alkyl group has 1 - 5 carbon atoms, and for X the alkoxy carbonyl, or alkoxy group has 1 - 5 carbon atoms, and for Y the alkoxy group has 1 - 2 carbon atoms.
Claim 13
Dependent Claim
17 words
The process of claim 1 wherein said substituted alkyl group is carboxyl, cyano or ester group substituted.
Claim 14
Dependent Claim
24 words
The process of claim 1, wherein said alkoxycarbonyl group and said alkoxy group have a carbon range of from 1 to 5 carbon atoms.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |