US3328191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive copying sheet
Assignee: Individual
•
Filing: 1964-03-02
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Granted: 1967-06-27
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 Hirsch Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A HEAT-SENSITIVE COPYING SHEET FOR MAKING CLEAR AND SHARP COPIES OF A GRAPHIC SUBJECT MATTER BY METHODS INVOLVING A BRIEF APPLICATION OF A HEAT PATTERN CORRESPONDING TO SAID GRAPHIC SUBJECT MATTER, SAID COPYING SHEET BEING VISIBLE STABLE AT NORMAL ROOM AND STORAGE TEMPERATURES AND UNDER EXPOSURE TO LIGHT, SAID COPYING SHEET INCLUDING A FLEXIBLE SUBSTRATE AND COATED THEREON A VISIBLY HEATSENSITIVE LAYER COMPRISING A METALLIC SOAP AND A REDUCING AGENT, SAID REACTANTS YIELDING NO COLOURED REACTION PRODUCTS AT A PH LOWER THAN 7, WHERE AT LEAST ONE OF THE TWO REACTANTS HAS A MELTING POINT BETWEEN 60 TO 120*C., AND THIRDLY A LATENT PH MODIFIER, SAID MODIFIER SELECTED FROM THE CLASS CONSISTING OF O-TOLUIDIEN ACETATE, HYDROQUINONE-PIPERAZINE COMPLEX, AND CATECHOL-P-PHENYLENE DIAMINE, ALL OF THE ABOVE IN UNIMOLECULAR CONTACT WITH ONE ANOTHER AND ADHERED ONTO THE FLEXIBLE SUBSTRATE WITH THE AID OF A NON-REACTIVE BINDER.
Claim 2
Dependent Claim
143 words
A HEAT-SENSITIVE COPYING SHEET FOR MAKING CLEAR AND SHARP COPIES OF A GRAPHIC SUBJECT MATTER BY METHODS INVOLVING A BRIEF APPLICATION OF A HEAT PATTERN CORRESPONDING TO SAID GRAPHIC SUBJECT MATTER, SAID COPYING SHEET BEING VISIBLE STABLE AT NORMAL ROOM AND STORAGE TEMPERATURES AND UNDER EXPOSURE TO LIGHT, SAID COPYING SHEET INCLUDING A FLEXIBLE SUBSTRATE AND COATED THEREON A VISIBLY HEATSENSITIVE LAYER COMPRISING A METALLIC SOAP AND A REDUCING AGENT, SAID REACTANTS YIELDING NO COLOURED REACTION PRODUCTS AT A PH LOWER THAN 7, WHERE AT LEAST ONE OF THE TWO REACTANTS HAS A MELTING POINT BETWEEN 60 TO 120*C., AND THIRDLY A LATENT PH MODIFIER, SAID MODIFIER SELECTED FROM THE CLASS CONSISTING OF O-TOLUIDIEN ACETATE, HYDROQUINONE-PIPERAZINE COMPLEX, AND CATECHOL-P-PHENYLENE DIAMINE, ALL OF THE ABOVE IN UNIMOLECULAR CONTACT WITH ONE ANOTHER AND ADHERED ONTO THE FLEXIBLE SUBSTRATE WITH THE AID OF A NON-REACTIVE BINDER.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |