Patent US4542505A successfully refreshed from Google Patents.
US2899334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive layer
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
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Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
C; C07; C07C; C07C50/00; C07C50/02; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; C07C37/00; C07C37/01; C07C37/055; C07C37/06; C07C37/07; C07C37/62; C07C45/00; C07C45/45; C07C45/46; C07C46/00; C07C46/02; C07C46/06; C07C49/00; C07C49/76; C07C49/82; C07C49/825; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A HEAT-SENSITIVE, COPYING SHEET COMPRISING A SUPPORT AND COATED ON SAID SUPPORT A HEAT-SENSITIVE AREA CONTAINING (A) A P-QUINONE COMPOUND AND (B) A DIHYDROXYBENZENE COMPOUND, AT LEAST ONE OF SAID COMPOUNDS HAVING A MELTING POINT BETWEEN ABOUT 55 AND 125*C., SAID COMPOUNDS BEING MAINTAINED IN PHYSICALLY-DISTINCT RELATIONSHIP AND IN CHEMICALLY-INTERACTIVE RELATIONSHIP SO THAT UPON EDPOSURE OF SAID HEAT-SENSITIVE AREA TO RADIANT ENERGY IN HEAT CONDUCTIVE ASSOCIATION WITH A PATTERN CONTAINING PORTIONS HIGHLY ABSORPTIVE OF SAID RADIANT ENERGY AND PORTIONS SUBSTANTIALLY NONABSORPTIVE OF SAID RADIANT ENREGY, SAID HEAT-SENSITIVE AREA UNDERGOES A RAPID COLOR CHANGE ONLY IN THOSE AREAS IN HEAT CONDUCTIVE ASSOCIATION WITH THOSE AREAS HIGHLY ABSORPTIVE OF SAID RADIANT ENERGY, SAID HEAT-SENSITIVE, COPYING SHEET BEING STABLE AT ROOM TEMPERATURE, BEING SUBSTANTIALLY INSENSITIVE TO VISIBLE RADIATION AND BEING NON-STICKING AT 125*C.
Claim 2
Dependent Claim
130 words
A HEAT-SENSITIVE, COPYING SHEET COMPRISING A SUPPORT AND COATED ON SAID SUPPORT A HEAT-SENSITIVE AREA CONTAINING (A) A P-QUINONE COMPOUND AND (B) A DIHYDROXYBENZENE COMPOUND, AT LEAST ONE OF SAID COMPOUNDS HAVING A MELTING POINT BETWEEN ABOUT 55 AND 125*C., SAID COMPOUNDS BEING MAINTAINED IN PHYSICALLY-DISTINCT RELATIONSHIP AND IN CHEMICALLY-INTERACTIVE RELATIONSHIP SO THAT UPON EDPOSURE OF SAID HEAT-SENSITIVE AREA TO RADIANT ENERGY IN HEAT CONDUCTIVE ASSOCIATION WITH A PATTERN CONTAINING PORTIONS HIGHLY ABSORPTIVE OF SAID RADIANT ENERGY AND PORTIONS SUBSTANTIALLY NONABSORPTIVE OF SAID RADIANT ENREGY, SAID HEAT-SENSITIVE AREA UNDERGOES A RAPID COLOR CHANGE ONLY IN THOSE AREAS IN HEAT CONDUCTIVE ASSOCIATION WITH THOSE AREAS HIGHLY ABSORPTIVE OF SAID RADIANT ENERGY, SAID HEAT-SENSITIVE, COPYING SHEET BEING STABLE AT ROOM TEMPERATURE, BEING SUBSTANTIALLY INSENSITIVE TO VISIBLE RADIATION AND BEING NON-STICKING AT 125*C.
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) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |