Patent US3932176A successfully refreshed from Google Patents.
US3932176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diacrylic acid ester derivatives of bis-hydantoin compounds
Assignee: Novartis Corp
•
Filing: 1974-05-20
•
Granted: 1976-01-13
•
Expires: 1994-05-20
Abstract
Abstract New diacrylates are obtained by a process in which oxalkylated bis-hydantoins are esterified with acrylic acid and/or methacrylic acid, or transesterified with acrylic acid ester and/or methacrylic acid ester. The new diacrylates are low-viscous liquids, which can be easily processed by virtue of their consistency; and the polymerisates produced therefrom, are distinguished by good flexural strength and high transparency.
Inventors
- 👤 Juergen Habermeier
- 👤 Daniel Porret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:30
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A diacrylic acid ester of a bis-hydantoin of the formula ##EQU27##
Claim 2
Dependent Claim
11 words
A diacrylic acid ester of a bis-hydantoin of the formula ##EQU27##
Claim 3
Dependent Claim
12 words
A diacrylic acid ester according to claim 1 of the formula: ##EQU28##
Claim 4
Dependent Claim
12 words
A diacrylic acid ester according to claim 1 of the formula: ##EQU29##
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |