US5023114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hydrophilic coating of plastics
Assignee: Biocoat Inc
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Filing: 1990-05-02
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Granted: 1991-06-11
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Expires: 2010-05-02
Abstract
Abstract Plastics, particularly a method of hydrophilic coating of plastics, for example, a contact lens, with a lubricating and visually acute mucopolysaccharide film which is immobilized upon the surface of the plastic for the lifetime of the plastic. A preferred method includes first coating the plastic with an aqueous solution of a mucopolysaccharide, drying by applying a water-miscible solvent, then crosslinking and permanently immobilizing the first coating upon the plastic by applying a solution of catalyzed organic soluble aliphatic polyisocyanate.
Inventors
- 👤 Gregory Halpern
- 👤 Charles Campbell
- 👤 Ellington M. Beavers
- 👤 Huk Y. Cheh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/28; C08G18/40; C08G18/62; C08G18/6216; C08G18/622; C08G18/6225; C08G18/6229; C08G18/64; C08G18/6484; C08G18/70; C08G18/72; C08G18/728; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/056; C08J2475/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A method of interlaminar grafting of continuous coatings upon an object, the coatings being different and not mutually soluble, the method comprising the steps of: (a) coating the object with a solution of a polymer having a plurality of functional groups capable of chemically reacting with a mucopolysaccharide, and manifesting a high degree of adhesion to the object, (b) removing solvent from said solution, so as to form a first continuous film, (c) applying as a second coat an aqueous solution of a mucopolysaccharide, (d) removing water from said second coat so as to form a second continuous film, and (e) chemically joining said first and second films so as to effect an interlaminar graft, wherein both films retain their individual integrity.
Claim 2
Independent Claim
122 words
A method of interlaminar grafting of continuous coatings upon an object, the coatings being different and not mutually soluble, the method comprising the steps of: (a) coating the object with a solution of a polymer having a plurality of functional groups capable of chemically reacting with a mucopolysaccharide, and manifesting a high degree of adhesion to the object, (b) removing solvent from said solution, so as to form a first continuous film, (c) applying as a second coat an aqueous solution of a mucopolysaccharide, (d) removing water from said second coat so as to form a second continuous film, and (e) chemically joining said first and second films so as to effect an interlaminar graft, wherein both films retain their individual integrity.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein the mucopolysaccharide is hyaluronic acid or one of its salts.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the mucopolysaccharide is chondroitin sulfate.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein the object to be coated is an optical lens.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein the object to be coated is a spectacle lens.
Claim 7
Dependent Claim
24 words
The method of claim 1, wherein the polymer forming the first film contains groups which are capable of forming covalent bonds with a mucopolysaccharide.
Claim 8
Dependent Claim
16 words
The method of claim 1, wherein the joining step comprises the step of heating the object.
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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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |