Patent US2770534A successfully refreshed from Google Patents.
US2770534A
Expired / Lapsed
US
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Method and material for making overlay masks
Assignee: PRINTING ARTS RES LAB Inc
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Filing: 1953-05-10
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Granted: 1956-11-13
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Expires: 1973-05-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter S Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:49
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/055; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
THE METHOD OF MAKING AN OVERLAY MASK ON A BASE SHEET OF TRANSPARENT OR TRANSLUCENT MATERIAL AND OF A TYPE ADAPTED FOR USE IN THE PRODUCTION OF RELIEF HALFTONE AND LITHOGRAPHIC PLATES FROM ART COPY HAVING TONE AND OTHER AREAS, WHICH METHOD COMPRISES THE STEPS OF APPLYING TO THE BASE SHEET A SURFACE EXPOSED LAYER OF A COLOR-CHANGABLE SUBSTANCE, DISTINGUISHING BETWEEN THE TONE AND OTHER AREAS OF THE ART COPY BY THE INCLUDION IN ONE OF SAID AREAS OF A NORMALLY INERT SUBSTANCE WHICH IS STATIONARY AT NORMAL ROOM TEMPERATURE AND SO SENSITIVE TO MILD HEAT AT AN ELEVATED TEMPERATURE THAT A GASEOUS REAGENT IS GENERATED FROM SAID SUBSTANCE, WHICH REAGENT IS CHEMICALLY REACTIVE IN ITS GASEOUS FORM WITH SAID COLOR-CHANGEABLE SUBSTANCE TO EFFECT A CHANGE OF THE COLOR THEREOF, PLACING THE BASE SHEET UPON THE ART COPY WITH THE COLOR-CHANGEABLE SUBSTANCE IN CONTACT WITH SAID AREAS THEREOF, AND HEATING THE CONTACTING SURFACES FROM ITS NORMAL ROOM TEMPERATURE TO A REAGENT-GENERATING TEMPERATURE FOR SAID INERT SUBSTANCE FOR A LIMITED PERIOD OF TIME TO EFFECT THE COLOR CHANGE OF THE COLOR-CHANEABLE SUBSTANCE.
Claim 2
Independent Claim
181 words
THE METHOD OF MAKING AN OVERLAY MASK ON A BASE SHEET OF TRANSPARENT OR TRANSLUCENT MATERIAL AND OF A TYPE ADAPTED FOR USE IN THE PRODUCTION OF RELIEF HALFTONE AND LITHOGRAPHIC PLATES FROM ART COPY HAVING TONE AND OTHER AREAS, WHICH METHOD COMPRISES THE STEPS OF APPLYING TO THE BASE SHEET A SURFACE EXPOSED LAYER OF A COLOR-CHANGABLE SUBSTANCE, DISTINGUISHING BETWEEN THE TONE AND OTHER AREAS OF THE ART COPY BY THE INCLUDION IN ONE OF SAID AREAS OF A NORMALLY INERT SUBSTANCE WHICH IS STATIONARY AT NORMAL ROOM TEMPERATURE AND SO SENSITIVE TO MILD HEAT AT AN ELEVATED TEMPERATURE THAT A GASEOUS REAGENT IS GENERATED FROM SAID SUBSTANCE, WHICH REAGENT IS CHEMICALLY REACTIVE IN ITS GASEOUS FORM WITH SAID COLOR-CHANGEABLE SUBSTANCE TO EFFECT A CHANGE OF THE COLOR THEREOF, PLACING THE BASE SHEET UPON THE ART COPY WITH THE COLOR-CHANGEABLE SUBSTANCE IN CONTACT WITH SAID AREAS THEREOF, AND HEATING THE CONTACTING SURFACES FROM ITS NORMAL ROOM TEMPERATURE TO A REAGENT-GENERATING TEMPERATURE FOR SAID INERT SUBSTANCE FOR A LIMITED PERIOD OF TIME TO EFFECT THE COLOR CHANGE OF THE COLOR-CHANEABLE SUBSTANCE.
References Cited (Backward Citations)
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US2067435A
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US2289714A
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US2596754A
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US2687949A
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US2634677A
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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) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |