Patent US3149990A successfully refreshed from Google Patents.
US3149990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive copy-sheet
Assignee: 3M Co
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Filing: 1962-01-19
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Granted: 1964-09-22
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Expires: 1982-01-19
Abstract
No abstract record available.
Inventors
- 👤 Robert F Coles
- 👤 Richard A Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:55
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/75; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; G; G03; G03C; G03C1/00; G03C1/52; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A HEAT-SENSITIVE COPY-SHEET CAPABLE OF UNDERGOING VISIBLE CHANGE ON BRIEF CONTACT WITH A METAL BAR HEATED TO A TEMPERATURE WITHIN THE APPROXIMATE RANGE OF 90150*C. AND SUITABLE FOR THE THERMOGRAPHIC REPRODUCTION OF DIFFERENTIALLY RADIATION-ABSORPTIVE GRAPHIC ORIGINALS AS HEREIN DESCRIBED, COMPRISING A THIN FLEXIBLE SHEET MATERIAL INCLUDING A VISIBLY HEAT-SENSITIVE LAYER COMPRISING (A) A NORMALLY SOLID CONDENSATION COMPOSITE OF A HETEROCYCLIC HYDRAZONE AND AN AMINE-REACTIVE ORGANIC COMPOUND, AND (B) A NORMALLY SOLID ORGANIC QUATERNARY NITROGEN PERSULFATE OXIDIZING AGENT FOR THE HYDRAZONE LINKAGE AND FURTHER CHARACTERIZED AS BEING RAPIDLY REACTIVE WITH 3-METHYL-2BENZOTHIAZOLINONE-1''-HYDROXY-2''-NAPHTHOYLHYDRAZONE IN HOT DILUTE SLIGHTLY ACIDIC SOLUTION WITH PRODUCTION OF A DEEP REDDISH PURPLE COLOR, SAID LAYER INCLUDING AN AZO COUPLER COMPONENT, SAID COMPONENTS (A) AND (B) BEING MAINTAINED IN PHYSICALLY DISTINCT, CHEMICALLY INTER-REACTIVE RELATIONSHIP, SAID COPY-SHEET BEING STABLE UNDER NORMAL OFFICE STORAGE AND USE CONDITIONS.
Claim 2
Dependent Claim
135 words
A HEAT-SENSITIVE COPY-SHEET CAPABLE OF UNDERGOING VISIBLE CHANGE ON BRIEF CONTACT WITH A METAL BAR HEATED TO A TEMPERATURE WITHIN THE APPROXIMATE RANGE OF 90150*C. AND SUITABLE FOR THE THERMOGRAPHIC REPRODUCTION OF DIFFERENTIALLY RADIATION-ABSORPTIVE GRAPHIC ORIGINALS AS HEREIN DESCRIBED, COMPRISING A THIN FLEXIBLE SHEET MATERIAL INCLUDING A VISIBLY HEAT-SENSITIVE LAYER COMPRISING (A) A NORMALLY SOLID CONDENSATION COMPOSITE OF A HETEROCYCLIC HYDRAZONE AND AN AMINE-REACTIVE ORGANIC COMPOUND, AND (B) A NORMALLY SOLID ORGANIC QUATERNARY NITROGEN PERSULFATE OXIDIZING AGENT FOR THE HYDRAZONE LINKAGE AND FURTHER CHARACTERIZED AS BEING RAPIDLY REACTIVE WITH 3-METHYL-2BENZOTHIAZOLINONE-1''-HYDROXY-2''-NAPHTHOYLHYDRAZONE IN HOT DILUTE SLIGHTLY ACIDIC SOLUTION WITH PRODUCTION OF A DEEP REDDISH PURPLE COLOR, SAID LAYER INCLUDING AN AZO COUPLER COMPONENT, SAID COMPONENTS (A) AND (B) BEING MAINTAINED IN PHYSICALLY DISTINCT, CHEMICALLY INTER-REACTIVE RELATIONSHIP, SAID COPY-SHEET BEING STABLE UNDER NORMAL OFFICE STORAGE AND USE CONDITIONS.
References Cited (Backward Citations)
US2967784A
Cited
US3076721A
Cited
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 |