US3137663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polystyrene and polystyrene-polymethylmethacrylate block polymers
Assignee: WR Grace and Co
•
Filing: 1959-10-09
•
Granted: 1964-06-16
•
Expires: 1979-10-09
Abstract
No abstract record available.
Inventors
- 👤 Michel E Mullier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:44
CPC Classifications
C; C08; C08F; C08F293/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF PREPARING A PRODUCT COMPRISING A POLYSTYRENE-POLYMETHYLMETHACRYLATE BLOCK POLYMER THAT INCLUDES THE STEPS OF HEATING A SOLUTION OF STYRENE CONTAINING TERT-BUTYLHYDROPEROXIDE AND COPPER OCTANOATE TO FORM A HOMOPOLYMERIC STYRENE BASE; RECOVERING THE SAID BASE; HEATING IT WITH A SOLUTION OF METHYLMETHACRYLATE TO FORM A MIXED PRODUCT COMPRISING ESSENTIALLY POLYSTYRENEPOLYMETHYLMETHACRYLATE BLOCK POLYMER, POLYSTYRENE HOMOPOLYMER, AND POLYMETHYLMETHACRYLATE HOMOPOLYMER; AND RECOVERING POLYSTYRENE-POLYMETHYLMETHACRYLATE BLOCK POLYMER FROM SAID MIXTURE.
Claim 2
Independent Claim
66 words
THE METHOD OF PREPARING A PRODUCT COMPRISING A POLYSTYRENE-POLYMETHYLMETHACRYLATE BLOCK POLYMER THAT INCLUDES THE STEPS OF HEATING A SOLUTION OF STYRENE CONTAINING TERT-BUTYLHYDROPEROXIDE AND COPPER OCTANOATE TO FORM A HOMOPOLYMERIC STYRENE BASE; RECOVERING THE SAID BASE; HEATING IT WITH A SOLUTION OF METHYLMETHACRYLATE TO FORM A MIXED PRODUCT COMPRISING ESSENTIALLY POLYSTYRENEPOLYMETHYLMETHACRYLATE BLOCK POLYMER, POLYSTYRENE HOMOPOLYMER, AND POLYMETHYLMETHACRYLATE HOMOPOLYMER; AND RECOVERING POLYSTYRENE-POLYMETHYLMETHACRYLATE BLOCK POLYMER FROM SAID MIXTURE.
References Cited (Backward Citations)
US2787604A
Cited
US2837496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |