Patent US5399160A successfully refreshed from Google Patents.
US3607848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing insoluble,cross-linked organic hydrogels comprising copolymers of glycol monoesters with diesters
Assignee: Czech Academy of Sciences
•
Filing: 1968-07-23
•
Granted: 1971-09-21
•
Expires: 1988-07-23
Abstract
Abstract Insoluble hydrogels are prepared by cross-linking linear or branched soluble copolymers of glycol methacrylates or glycol acrylates with glycol dimethacrylates or glycol diacrylates, preferably in presence of glycol acrylate or glycol methacrylate monomers which may contain the respective diester, and preferably also in presence of initiators liberating free radicals, and in presence of solvents having the interaction parameter Chi . Soluble glycol methacrylate or acrylate polymers can be used in form of fine solid particles and the cross-linking may be aided by heating till to about 150* C.
Inventors
- 👤 Vladimir Stoy
- 👤 Richard Chromecek
- 👤 Zdenek Tuzar
- 👤 Miroslav Stol
- 👤 Karel Kliment
- 👤 Jaroslava Otoupalova
- 👤 Miloslav Bohdanecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/28; C08F265/00; C08F265/04; Y; Y10; Y10S; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
Method as set forth in claim 1, wherein the final step of cross-linking is carried out by heating to temperatures ranging from 85 to 200* C.
Claim 2
Dependent Claim
38 words
Method as set forth in claim 1, wherein the final step of cross-linking is carried out in presence of an added major amount relative to said monomers of a comonomer capable of copolymerization with the said soluble copolymer.
Claim 3
Dependent Claim
34 words
Method as set forth in claim 1, wherein the final step of cross-linking is carried out in presence of solvents, having the interaction parameter with respect to the polymer thus formed higher than 0.5.
Claim 4
Dependent Claim
24 words
Method as set forth in claim 1, wherein the final step of cross-linking is carried out in presence of polymerization initiators liberating free radicals.
Claim 5
Dependent Claim
21 words
Method as set forth in claim 1, wherein the final step of cross-linking is carried out by irradiating with ionizing rays.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |