US3361858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reshaping a xerogel by mechanical removal and swelling to form a hydrogel contact lens
Assignee: Czech Academy of Sciences
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Filing: 1965-01-07
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Granted: 1968-01-02
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Wichterle Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:07
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; B; B29; B29C; B29C71/00; B29C71/0009; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00067; B29D11/00932; B29D11/00942; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF PREPARING A CONTACT LENS WHICH COMPRISES: (A) PREPARING A LENS BLANK FROM A XEROGEL, THE XEROGEL BEING A SPARINGLY CROSS-LINKED ORGANIC POLYMER HAVING RECURRING HYDROPHILIC GROUPS IN THE MOLECULE THEREOF; (B) REMOVING SELECTED PORTIONS OF SAID BLANK UNTIL THE REMAINDER OF THE BLANK CONSTITUTES A REPLICA OF THE DESIRED LENS ON A REDUCED SCALE; AND (C) CONTACTING SAID REPLICA WITH AN AQUEOUS LIQUID UNTIL THE REPLICA SWELLS TO A STATE OF OSMOTIC EQUILIBRIUM WITH PHYSIOLOGICA SALINE SOLUTION.
Claim 2
Independent Claim
80 words
A METHOD OF PREPARING A CONTACT LENS WHICH COMPRISES: (A) PREPARING A LENS BLANK FROM A XEROGEL, THE XEROGEL BEING A SPARINGLY CROSS-LINKED ORGANIC POLYMER HAVING RECURRING HYDROPHILIC GROUPS IN THE MOLECULE THEREOF; (B) REMOVING SELECTED PORTIONS OF SAID BLANK UNTIL THE REMAINDER OF THE BLANK CONSTITUTES A REPLICA OF THE DESIRED LENS ON A REDUCED SCALE; AND (C) CONTACTING SAID REPLICA WITH AN AQUEOUS LIQUID UNTIL THE REPLICA SWELLS TO A STATE OF OSMOTIC EQUILIBRIUM WITH PHYSIOLOGICA SALINE SOLUTION.
References Cited (Backward Citations)
US2332930A
Cited
US3030859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |