US3609360A
Expired / Lapsed
US
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Negative projection transparencies and method
Assignee: JOSEPH A WIESE JR
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Filing: 1969-09-15
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Granted: 1971-09-28
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Expires: 1989-09-15
Abstract
Abstract Clear-colored film products, which are decolorized at image areas by thermographic heating to form negative projection transparencies of positive originals, contain a colored reaction product of a color precursor and a volatilizable acid. The colored compound is decomposed and the liberated acid is volatilized and removed at the heated image areas, leaving a clear colorless transparent image.
Inventors
- 👤 Joseph A Wiese Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:37
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; Y; Y10; Y10S; Y10S430/00; Y10S430/165; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24843
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The product of claim 1 wherein said reaction product is in solution in a polymeric binder.
Claim 2
Dependent Claim
18 words
The product of claim 2 wherein said layer is transparent and is carried on a heat-resistant transparent backing.
Claim 3
Dependent Claim
31 words
The product of claim 3 wherein said layer is about 2-3 microns in thickness and the colored reaction product is present therein in a concentration of about 1 to 3 percent.
Claim 4
Dependent Claim
11 words
The product of claim 4 wherein said acid is salicylic acid.
Claim 5
Independent Claim
76 words
The method comprising placing a colored sheet material, having a thin uniform color layer comprising a heat-decomposable, colored reaction product of a protonatable chromogenous dye-forming color progenitor and an organic acid volatilizable from said product at a temperature within the range of 50* to 250* C., in heat-conductive contact with a differentially infrared-absorptive graphic original, and briefly exposing said original to intense infrared radiation to produce a negative copy of said original in said color layer.
Claim 6
Dependent Claim
32 words
The method of claim 6 wherein said sheet material is in face-to-face contact with a second sheet material having a thin, uniform, substantially colorless, and acid-free coating comprising a said color progenitor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |