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US3149992A
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Heat sensitive sheets
Assignee: Nashua Corp
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Filing: 1962-06-29
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Granted: 1964-09-22
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 William R Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:48
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; G; G03; G03C; G03C1/00; G03C1/52; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A HEAT MARKING COPY SHEET RESPONSIVE TO HEATING TO AN ELEVATED ACTIVATION TEMPERATURE BY CHANGING VISIBLY TO A CONTRASTING COLOR COMPRISING, IN COMBINATION, A SUPPORT CARRYING INDICATOR MATERIAL WHICH CHANGES COLOR BY CHEMICAL REACTION WITH A BASIC ORGANIC AMINE; AND A STABLE UNREACTIVE HEAT SENSITIVE LATENT DEVELOPER IN INTIMATE ASSOCIATION WITH SAID MATERIAL FOR CAUSING A COLOR CHANGE UPON HEATING SAID SHEET TO AN ACTIVATION TEMPERATURE BETWEEN 50*C. AND 150 C., SAID DEVELOPER BEING AN ORGANIC AMINE IN COMBINATION WITH A HYDROXYPHENYL SUBSTITUTED CHROMAN FORMING A SOLID CRYSTALLINE COMPLEX WHICH IS STABLE UNDER NORMAL CONDITIONS OF TEMPERATURE AND HUMIDITY AND DISSOCIABLE AT SAID ACTIVATION TEMPERATURE TO YIELD SAID AMINE TO CAUSE SAID COLOR CHANGE.
Claim 2
Dependent Claim
114 words
A HEAT MARKING COPY SHEET RESPONSIVE TO HEATING TO AN ELEVATED ACTIVATION TEMPERATURE BY CHANGING VISIBLY TO A CONTRASTING COLOR COMPRISING, IN COMBINATION, A SUPPORT CARRYING INDICATOR MATERIAL WHICH CHANGES COLOR BY CHEMICAL REACTION WITH A BASIC ORGANIC AMINE; AND A STABLE UNREACTIVE HEAT SENSITIVE LATENT DEVELOPER IN INTIMATE ASSOCIATION WITH SAID MATERIAL FOR CAUSING A COLOR CHANGE UPON HEATING SAID SHEET TO AN ACTIVATION TEMPERATURE BETWEEN 50*C. AND 150 C., SAID DEVELOPER BEING AN ORGANIC AMINE IN COMBINATION WITH A HYDROXYPHENYL SUBSTITUTED CHROMAN FORMING A SOLID CRYSTALLINE COMPLEX WHICH IS STABLE UNDER NORMAL CONDITIONS OF TEMPERATURE AND HUMIDITY AND DISSOCIABLE AT SAID ACTIVATION TEMPERATURE TO YIELD SAID AMINE TO CAUSE SAID COLOR CHANGE.
References Cited (Backward Citations)
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US2732299A
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US2681277A
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US3076707A
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US2995466A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |