Patent US3812205A successfully refreshed from Google Patents.
US3812205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing graftlinked heteropolymer film
Assignee: Rohm and Haas Co
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Filing: 1972-09-20
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Granted: 1974-05-21
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Expires: 1992-09-20
Abstract
Abstract PRODUCTION OF HETEROPOLYMER LATEX PARTICLES WHEREIN THE PARTICLES CONSIST ESSENTIALLY OF A FIRST-STAGE RUBBERY CROSSLINKED EMULSION POLYMER HAVING A TG BELOW 10* C. COMPRISING AT LEAST ONE C1 TO C8 ALKYL ACRYLATE AND A GRAFTLINKER AND A SECOND-STAGE THERMOPLASTIC POLYMER HAVING A TG ABOVE ABOUT 60* C. COMPRISING A HARD ALKYL ESTER OF METHACRYLIC ACID GRAFTLINKED TO SAID FIRST-STAGE BY ADDING GRADUALLY A STREAM OF SAID SECOND-STAGE MONOMER TO SAID FIRST-STAGE AND POLYMERIZING RAPIDLY THE SECOND-STAGE MONOMER. THE POLYMER PARTICLES ARE PREFERABLY ISOLATED, DRIED AND CONVERTED INTO FILM USING HEAT AND PRESSURE.
Inventors
- 👤 David Lamar Dunkelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:21
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06
Claims Analysis
Total Claims: 0
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |