US3121702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium sulfate plasters containing alkyl acrylate copolymers
Assignee: Wyeth Holdings LLC
•
Filing: 1959-09-09
•
Granted: 1964-02-18
•
Expires: 1979-09-09
Abstract
No abstract record available.
Inventors
- 👤 Allan E Sherr
- 👤 Roshal Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A CALCIUM SULFATE PLASTER CONSISTING ESSENTIALLY OF A MIXTURE OF A HYDRATABLE CALCIUM SULFATE AND FROM 0.0002% TO ABOUT 2% BY WEIGHT, BASED UPON THE DRY WEIGHT OF THE PLASTER, OF A COPOLYMER OF ABOUT 50-90 PARTS BY WEIGHT OF AN ALKYL ACRYLATE MONOMER IN WHICH THE ALKYL RADICALS CONTAIN FROM 1 TO 6 CARBON ATOMS WITH ABOUT 5-10 PARTS OF A VINYL MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND ACRYLONITRILE.
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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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |