Patent US3499844A successfully refreshed from Google Patents.
Patent US2593827A successfully refreshed from Google Patents.
US2593827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting sheets of polymerized alpha-chloroacrylic acid esters
Assignee: GAF Chemicals Corp
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Filing: 1950-11-07
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Granted: 1952-04-22
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Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 Harry D Anspon
- 👤 Frank E Pschorr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:42
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/003; B29C39/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE PRODUCTION OF POLYMER SHEETS BY THERMAL POLYMERIZATION OF A MEMBER OF THE GROUP CONSISTING OF MONOMERIC A-CHLOROACRYLIC ACID, ACHLOROACRYLIC, A-CHLOROACRYLAMIDE AND ESTERS OF A-CHLOROACRYLIC ACID, BETWEEN GLASS MOLD PLATES INTERCONNECTED BY A FLEXIBLE EDGE CLOSURE AND SUBJECT TO FORMATION OF A POLYMER LIP AT THE EDGE OF THE MOLD PLATES, SAID MONOMER CONTAINING AN AGENT WHICH REDUCES THE ADHESION OF THE RESULTING POLYMER TOWARD GLASS, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID MOLD PLATES FROM THE POLYMER SHEET WHEN THE LATTER HAS COOLED TO A TEMPERATURE 30 TO 40* C. BELOW ITS INITIAL HEAT DISTORTION TEMPERATURE, AFTER COMPLETING THE POLYMERIZATION AT A HIGHER TEMPERATURE.
Claim 2
Dependent Claim
105 words
IN THE PRODUCTION OF POLYMER SHEETS BY THERMAL POLYMERIZATION OF A MEMBER OF THE GROUP CONSISTING OF MONOMERIC A-CHLOROACRYLIC ACID, ACHLOROACRYLIC, A-CHLOROACRYLAMIDE AND ESTERS OF A-CHLOROACRYLIC ACID, BETWEEN GLASS MOLD PLATES INTERCONNECTED BY A FLEXIBLE EDGE CLOSURE AND SUBJECT TO FORMATION OF A POLYMER LIP AT THE EDGE OF THE MOLD PLATES, SAID MONOMER CONTAINING AN AGENT WHICH REDUCES THE ADHESION OF THE RESULTING POLYMER TOWARD GLASS, THE IMPROVEMENT WHICH COMPRISES REMOVING SAID MOLD PLATES FROM THE POLYMER SHEET WHEN THE LATTER HAS COOLED TO A TEMPERATURE 30 TO 40* C. BELOW ITS INITIAL HEAT DISTORTION TEMPERATURE, AFTER COMPLETING THE POLYMERIZATION AT A HIGHER TEMPERATURE.
References Cited (Backward Citations)
US2457114A
Cited
US2480751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |