US3217642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for printing plates having improved shrinkage
Assignee: WR Grace and Co
•
Filing: 1963-09-05
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Granted: 1965-11-16
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Expires: 1983-09-05
Abstract
No abstract record available.
Inventors
- 👤 Audrey S Tompkins
- 👤 Deposit Boston Safe
- 👤 Company Trust
- 👤 John F Broderick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:00
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS FOR MAKING THERMOSET PRINTING PLATES WHICH COMPRISES PROVIDING A MATRIX HAVING A CAVITY BEARING REPRODUCIBLE MATTER, FILLING THE CAVITY WITH A LIQUID COMPOSITION CONSISTING OF ONE PART BY WEIGHT OF VINYL CHLORIDE POLYMER, ABOUT .005 TO .010 PART BY WEIGHT OF ZINC OXIDE, ABOUT 0.5 TO 3.0 PARTS BY WEIGHT OF THE REACTION PRODUCT OF A NON-RESINOUS EPOXY COMPOUND AND AN IMIDAZOLINE, AND BETWEEN ABOUT 1.5 AND 8.0 PERCENT BY WEIGHT OF A BLOWING AGENT, SAID OXIDE, REACTION PRODUCT AND BLOWING AGENT BEING BASED ON THE WEIGHT OF THE VINYL CHLORIDE POLYMER, PREHEATING THE ASSEMBLED MATRIX IN AN OPEN PRESS AT A TEMPERATURE OF ABOUT 162*C. FOR APPROXIMATELY 3 TO 5 MINUTES, CLOSING THE PRESS, THEREAFTER MAINTAINING THE TEMPERATURE CONSTANT AT ABOUT 162*C. FOR ABOUT 9 AND ONE-HALF MINUTES AND SEPARATING THE RESULTING PLATE FROM SAID MATRIX.
Claim 2
Dependent Claim
46 words
A PROCESS ACCORDING TO CLAIM 4 WHEREIN THE COMPOSITION ADDITIONALLY CONTAINS ABOUT .01 TO .05 PART BY WEIGHT OF A MOISTURE-SEQUESTERING AGENT AND ABOUT 0 TO .10 PART BY WEIGHT OF A VISCOSITY-LOWERING AGENT, SAID AGENTS BEING BASED ON THE WEIGHT OF THE VINYL CHLORIDE POLYMER.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |