US4273734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting of polyelectrolytes in hydrogel molds
Assignee: Individual
•
Filing: 1979-09-24
•
Granted: 1981-06-16
•
Expires: 1999-09-24
Abstract
Abstract Conformable hydrogel molds or forms are adapted for the casting of polyelectrolytic materials whereby an irreversibly gelled, three dimensional article faithfully reproduces the interior topography of the mold.
Inventors
- 👤 Maurice Seiderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; B; B29; B29C; B29C39/00; B29C39/003; B29C39/006; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00086; B29K; B29K2096/00; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
The method of preparing a three-dimensional, irreversibly gelled shaped article, which method comprises diffusing gel-forming ions into a solution of a polyelectrolyte capable of insolubilization upon interaction with said gel-forming ions, whereby to produce the irreversibly gelled insoluble shaped polyelectrolytic article, the said gel-forming ions being diffused into the polyelectrolyte solution by transport from a hydrogel which defines a mold cavity and is swollen with a solution comprising said gel-forming ions.
Claim 2
Independent Claim
71 words
The method of preparing a three-dimensional, irreversibly gelled shaped article, which method comprises diffusing gel-forming ions into a solution of a polyelectrolyte capable of insolubilization upon interaction with said gel-forming ions, whereby to produce the irreversibly gelled insoluble shaped polyelectrolytic article, the said gel-forming ions being diffused into the polyelectrolyte solution by transport from a hydrogel which defines a mold cavity and is swollen with a solution comprising said gel-forming ions.
Claim 3
Dependent Claim
31 words
The method as defined by claim 1, wherein the transport of the gel-forming ions from the hydrogel to the polyelectrolyte is assisted by means of the application of an electrical current.
Claim 4
Dependent Claim
13 words
The method as defined by claim 1, wherein the polyelectrolyte is a polysaccharide.
Claim 5
Dependent Claim
13 words
The method as defined by claim 3, wherein the polysaccharide is an alginate.
Claim 6
Dependent Claim
12 words
The method as defined by claim 1, wherein the polyelectrolyte is collagen.
Claim 7
Dependent Claim
15 words
The method as defined by claim 1, wherein the said gel-forming ions are metallic ions.
Claim 8
Dependent Claim
14 words
The method as defined by claim 6, wherein the said metal ions are polyvalent.
Claim 9
Dependent Claim
18 words
The method as defined by claim 1, wherein the said mold cavity is shaped as a contact lens.
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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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |