US3856552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color projection transparencies
Assignee: 3M Co
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Filing: 1973-04-02
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Granted: 1974-12-24
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Expires: 1993-04-02
Abstract
Abstract Sheet material, which forms a color projection transparency when imaged with salicylic acid vapor, achieves improved color intensity and fade-resistance from a combination of protonatable color progenitor and oxidizable leuco cyanine or styryl dye precursor.
Inventors
- 👤 F Deyak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:39
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; B41M5/30; B41M5/323; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
49 words
SHEET MATERIAL, WHICH RAPIDLY DEVELOPS A LONGLASTING COLOR WHEN FIRST BRIEFLY SUBJECTED TO VAPORS OF SALICYCLIC ACID, HAVING AN ACTIVE COLOR-FORMING STRATUM COMPRISING A MIXTURE OF (A) A PROTONATABLE CHROMOGENOUS DYE-FORMING COLOR PROGENITOR AND (B) A SUBSTANTIALLY COLORLESS OXIDAZABLE N-HYDROCARBYLSUBSTITUTED DIHYDROHETEROCYCLIC AMINE PRECURSOR OF A STYRYL OR CYANINE DYE.
Claim 2
Dependent Claim
49 words
SHEET MATERIAL, WHICH RAPIDLY DEVELOPS A LONGLASTING COLOR WHEN FIRST BRIEFLY SUBJECTED TO VAPORS OF SALICYCLIC ACID, HAVING AN ACTIVE COLOR-FORMING STRATUM COMPRISING A MIXTURE OF (A) A PROTONATABLE CHROMOGENOUS DYE-FORMING COLOR PROGENITOR AND (B) A SUBSTANTIALLY COLORLESS OXIDAZABLE N-HYDROCARBYLSUBSTITUTED DIHYDROHETEROCYCLIC AMINE PRECURSOR OF A STYRYL OR CYANINE DYE.
Claim 3
Dependent Claim
14 words
Sheet material of claim 1 wherein the ''''B'''' component is a 1, 3,3-trimethyl indolene.
Claim 4
Dependent Claim
19 words
Sheet material of claim 1 including a transparent carrier film and wherein said stratum includes a polymeric film-forming binder.
Claim 5
Dependent Claim
24 words
Sheet material of claim 3 wherein said mixture contains the ''''A'''' and ''''B'''' components in a ratio of from about 2:1 to about 1:2.
Claim 6
Dependent Claim
88 words
A COPY-SHEET ASSEMBLY USEFUL IN MAKING A COLOR PROJECTION TRANSPARENCY COPY OF A GRAPHIC ORGINICAL BY THE THERMOGRAPHIC COPYING PROCESS AND CONSISTING OF A COLOR-F0RMING FILM MEMBER AND AN ACID SOURCE SHEET RELEASABLY TABBED TOGETHER ALONG ONE COMMON MARGIN IN FACE-T0-FACE RELATIONSHIP AND AN ACID-IMPERVIOUS SEPARATOR SHEET REMOVABLY POSITIONED THEREBETWEEN, AND WHEREIN SAID COLOR-FORMING MEMBER INCLUDES A TRANSPARENT CARRIER FILM COATED WITH A MIXTURE IN A POLYMERIC BINDER OF A PROTONATABLE CHROMOGENOUS DYE-FORMING COLOR PROGENITOR AND AN OXIDAZABLE B-HYDROCARBYL-SUBSTITUTED DIHYDROHETEROCYCLIC AMINE PRECURSOR OF A STYRYL OR CYANINE DYE.
Claim 7
Dependent Claim
88 words
A COPY-SHEET ASSEMBLY USEFUL IN MAKING A COLOR PROJECTION TRANSPARENCY COPY OF A GRAPHIC ORGINICAL BY THE THERMOGRAPHIC COPYING PROCESS AND CONSISTING OF A COLOR-F0RMING FILM MEMBER AND AN ACID SOURCE SHEET RELEASABLY TABBED TOGETHER ALONG ONE COMMON MARGIN IN FACE-T0-FACE RELATIONSHIP AND AN ACID-IMPERVIOUS SEPARATOR SHEET REMOVABLY POSITIONED THEREBETWEEN, AND WHEREIN SAID COLOR-FORMING MEMBER INCLUDES A TRANSPARENT CARRIER FILM COATED WITH A MIXTURE IN A POLYMERIC BINDER OF A PROTONATABLE CHROMOGENOUS DYE-FORMING COLOR PROGENITOR AND AN OXIDAZABLE B-HYDROCARBYL-SUBSTITUTED DIHYDROHETEROCYCLIC AMINE PRECURSOR OF A STYRYL OR CYANINE DYE.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |