US3220960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked hydrophilic polymers and articles made therefrom
Assignee: Individual
•
Filing: 1960-12-21
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Granted: 1965-11-30
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Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Wichterle Otto
- 👤 Lim Drahoslav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
B; B29; B29C; B29C39/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; Y; Y10; Y10S; Y10S425/00; Y10S425/808; Y10S524/00; Y10S524/916; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A SHAPED BODY ESSENTIALLY CONSISTING OF A HYDROGEL OF A SPARINGLY CROSS-LINKED HYDROPHILIC POLYMER AND OF 20 TO 97% OF AN AQUEOUS LIQUID, SAID POLYMER BEING A COPOLYMER OF A MAJOR AMOUNT OF A POLYMERIZABLE MONOESTER OF AN OLEFINIC ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACID, SAID MONOESTER HAVING A SINGLE OLEFINIC DOUBLE BOND, WITH A MINOR AMOUNT OF A POLYMERIZABLE DIESTER OF ONE OF SAID ACIDS, SAID DIESTER HAVING AT LEAST TWO OLEFINIC DOUBLE BONDS, SAID MONOESTERS AND DIESTERS BEING WATER SOLUBLE, SAID MONOESTER HAVING A HYDROPHILIC FUNCTIONAL GROUP.
Claim 2
Dependent Claim
94 words
A SHAPED BODY ESSENTIALLY CONSISTING OF A HYDROGEL OF A SPARINGLY CROSS-LINKED HYDROPHILIC POLYMER AND OF 20 TO 97% OF AN AQUEOUS LIQUID, SAID POLYMER BEING A COPOLYMER OF A MAJOR AMOUNT OF A POLYMERIZABLE MONOESTER OF AN OLEFINIC ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACID, SAID MONOESTER HAVING A SINGLE OLEFINIC DOUBLE BOND, WITH A MINOR AMOUNT OF A POLYMERIZABLE DIESTER OF ONE OF SAID ACIDS, SAID DIESTER HAVING AT LEAST TWO OLEFINIC DOUBLE BONDS, SAID MONOESTERS AND DIESTERS BEING WATER SOLUBLE, SAID MONOESTER HAVING A HYDROPHILIC FUNCTIONAL GROUP.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |