Patent CH436677A successfully refreshed from Google Patents.
US4423116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reusable projection transparency
Assignee: WTA Inc
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Filing: 1982-03-15
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Granted: 1983-12-27
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Expires: 2002-03-15
Abstract
Abstract A thermally-responsive transparent film is disclosed which comprises certain chromogenic material and certain color developer material. With this film marks are developed in response to the application of heat to form an image. These images can be erased by the action of certain liquids or vapors. The imaged and erased states are fixed under a range of environmental conditions. This film finds particular utility as a reusable projection transparency.
Inventors
- 👤 Richard E. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:54
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
A reversibly thermally-responsive transparent film comprising a transparent film substrate coated with a solid solution consisting essentially of: (a) at least one chromogenic compound selected from the group consisting of: crystal violet lactone, 3,3-bis(p-dimethylaminophenyl)phthalide, 3,3-bis(1-ethyl-2-methylindol-3-yl)phthalide, 3-(1-ethyl-2-methylindol-3-yl)-3-(4-diethylamino-2-ethoxyphenyl)phthalide, a mixture of the isomers 5-(1-ethyl-2-methylindol-3-yl)-5-(4-dimethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one and 7-(1-ethyl-2-methylindol-3-yl)-7-(4-diethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one, a mixture of the isomers 5-(1,2-dimethylindol-3-yl)-5-(4-dimethylaminophenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one and 7-(1,2-dimethylindol-3-yl)-7-(4-dimethylaminophenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one, 6-diethylamino-2-(N-heptanoylamino)fluoran, 6-diethylamino-2-butoxyfluoran, 2-chloro-6-diethylamino-3-methyl-fluoran, 6-diethylamino-1,3,4-trimethylfluoran, 6-cyclohexylamino-2-methylfluoran, 9-diethylamino-spiro[12H-benzo(a)xanthene-12,1'(3'H)isobenzofuran-3'-one], 3',6'-diethylamino-spiro[1H-2-N-acetylisoindole-3-one-1,9'-xanthene], 3',6'-diethylamino-spiro[1,2-benz-2-N-ethyl-1,1-dioxyisothiazoline-3,9'-xanthene], bis(4,4'-diethylaminophenyl)ketone, N-Benzoylauramine, 1-(4-dimethylaminophenyl)-2-(quinolin-4-yl)ethylene, 1-phenyl-1-p-dimethylaminophenyl-6-dimethylamino-3-oxo-isochroman, bis(4,4'-diethylaminophenyl)-phenyliminomethane, 4-(p-ethoxyphenylazo)-m-phenylene diamine, 5',5"-dibromo-o-cresol-sulfonephthalein, 3-(1-ethyl-2-methylindol-3-yl)-3-(4-diethylamino-2-butoxyphenyl)phthalide and 6-diethylamino-2-dibenzylaminofluoran; (b) at least one color developer selected from the group consisting of: phloroglucinol, gallic acid and 2',4',6'-trihydroxyacetophenone; and (c) a suitable transparent binder therefor wherein a heat-developed image, formed by said chromogenic compound and said color developer, is stable to changes in temperature below the imaging temperature of the film.
Claim 2
Dependent Claim
121 words
A reversibly thermally-responsive transparent film comprising a transparent film substrate coated with a solid solution consisting essentially of: (a) at least one chromogenic compound selected from the group consisting of: crystal violet lactone, 3,3-bis(p-dimethylaminophenyl)phthalide, 3,3-bis(1-ethyl-2-methylindol-3-yl)phthalide, 3-(1-ethyl-2-methylindol-3-yl)-3-(4-diethylamino-2-ethoxyphenyl)phthalide, a mixture of the isomers 5-(1-ethyl-2-methylindol-3-yl)-5-(4-dimethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one and 7-(1-ethyl-2-methylindol-3-yl)-7-(4-diethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one, a mixture of the isomers 5-(1,2-dimethylindol-3-yl)-5-(4-dimethylaminophenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one and 7-(1,2-dimethylindol-3-yl)-7-(4-dimethylaminophenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one, 6-diethylamino-2-(N-heptanoylamino)fluoran, 6-diethylamino-2-butoxyfluoran, 2-chloro-6-diethylamino-3-methyl-fluoran, 6-diethylamino-1,3,4-trimethylfluoran, 6-cyclohexylamino-2-methylfluoran, 9-diethylamino-spiro[12H-benzo(a)xanthene-12,1'(3'H)isobenzofuran-3'-one], 3',6'-diethylamino-spiro[1H-2-N-acetylisoindole-3-one-1,9'-xanthene], 3',6'-diethylamino-spiro[1,2-benz-2-N-ethyl-1,1-dioxyisothiazoline-3,9'-xanthene], bis(4,4'-diethylaminophenyl)ketone, N-Benzoylauramine, 1-(4-dimethylaminophenyl)-2-(quinolin-4-yl)ethylene, 1-phenyl-1-p-dimethylaminophenyl-6-dimethylamino-3-oxo-isochroman, bis(4,4'-diethylaminophenyl)-phenyliminomethane, 4-(p-ethoxyphenylazo)-m-phenylene diamine, 5',5"-dibromo-o-cresol-sulfonephthalein, 3-(1-ethyl-2-methylindol-3-yl)-3-(4-diethylamino-2-butoxyphenyl)phthalide and 6-diethylamino-2-dibenzylaminofluoran; (b) at least one color developer selected from the group consisting of: phloroglucinol, gallic acid and 2',4',6'-trihydroxyacetophenone; and (c) a suitable transparent binder therefor wherein a heat-developed image, formed by said chromogenic compound and said color developer, is stable to changes in temperature below the imaging temperature of the film.
Claim 3
Dependent Claim
15 words
The thermally-responsive transparent film of claim 1 which further comprises a protective transparent surface coating.
Claim 4
Dependent Claim
22 words
The thermally-responsive transparent film of claim 1 wherein the color developer is selected from the group consisting of phloroglucinol and gallic acid.
Claim 5
Dependent Claim
14 words
The thermally-responsive transparent film of claim 3 wherein the color developer is gallic acid.
Claim 6
Dependent Claim
28 words
The thermally-responsive transparent film of claim 4 wherein the chromogenic compound is selected from the group consisting of: crystal violet lactone, 6-cyclohexylamino-2-methylfluoran, 2-chloro-6-diethylamino-3-methylfluoran, 6-diethylamino-1,3,4-trimethylfluoran, 3-(1-ethyl-2-methylindol-3-yl)-3-(4-diethylamino-2-butoxyphenyl)phthalide, 3,3-bis(1-ethyl-2-methylindol-3-yl)phthalide and 9-diethylamino-spiro[12H-benzo(a)xanthene-12,1'(3'H)isobenzofuran-3'-one].
Claim 7
Dependent Claim
15 words
The thermally-responsive transparent film of claim 5 wherein the chromogenic compound is crystal violet lactone.
Claim 8
Dependent Claim
14 words
The thermally-responsive transparent film of claim 6 which further includes the chromogenic compound 6-cyclohexylamino-2-methylfluoran.
Claim 9
Dependent Claim
13 words
The thermally-responsive transparent film of claim 3, wherein the color developer is phloroglucinol.
Claim 10
Dependent Claim
32 words
The thermally-responsive transparent film of claim 8 wherein the chromogenic compound is selected from the group consisting of: crystal violet lactone, 6-diethylamino-1,3,4-trimethylfluoran, 6-diethylamino-2-dibenzylaminofluoran and a mixture of the isomers 5-(1-ethyl-2-methylindol-3-yl)-5-(4-dimethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one and 7-(1-ethyl-2-methylindol-3-yl)-7-(4-dimethylamino-2ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one.
Claim 11
Dependent Claim
15 words
The thermally-responsive transparent film of claim 9 wherein the chromogenic compound is crystal violet lactone.
Claim 12
Dependent Claim
52 words
A reversibly thermally-responsive transparent film consisting essentially of a transparent polyester film substrate coated with a solid solution comprising crystal violet lactone, 1,3,5-trihydroxybenzene and cellulose acetate wherein a heat-developed image, formed by said crystal violet lactone and said 1,3,5-trihydroxybenzene, is stable to changes in temperature below the imaging temperature of the film.
Claim 13
Dependent Claim
52 words
A reversibly thermally-responsive transparent film consisting essentially of a transparent polyester film substrate coated with a solid solution comprising crystal violet lactone, 1,3,5-trihydroxybenzene and cellulose acetate wherein a heat-developed image, formed by said crystal violet lactone and said 1,3,5-trihydroxybenzene, is stable to changes in temperature below the imaging temperature of the film.
Claim 14
Dependent Claim
15 words
The thermally-responsive transparent film of claim 11 which further comprises a protective polystyrene surface coating.
References Cited (Backward Citations)
US4028118A
Cited
US4025090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |