Patent EP0456103A2 successfully refreshed from Google Patents.
Patent US4959074A successfully refreshed from Google Patents.
US4959074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hydrophilic coating of plastics
Assignee: Biocoat Inc
•
Filing: 1988-05-25
•
Granted: 1990-09-25
•
Expires: 2008-05-25
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 solution aliphatic polyisocyanates.
Inventors
- 👤 Gergory Halpern
- 👤 Charles Campbell
- 👤 Ellington M. Beavers
- 👤 Huk Y. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
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; Y; Y10; Y10S; Y10S623/00; Y10S623/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
An optically clear plastic having at least one exterior surface with a hydrophilic coating immobilized by crosslinking, comprising: (a) a first coating of an aqueous solution of mucopolysaccharide which is dried by applying a water-miscible solvent from the group consisting of acetone, methyl alcohol, methyl ethyl ketone and ethyl alcohol; and (b) a second coating of a solution of catalyzed organic-soluble aliphatic polyisocyanate, applied as a crosslinker and immobilizer.
Claim 2
Dependent Claim
69 words
An optically clear plastic having at least one exterior surface with a hydrophilic coating immobilized by crosslinking, comprising: (a) a first coating of an aqueous solution of mucopolysaccharide which is dried by applying a water-miscible solvent from the group consisting of acetone, methyl alcohol, methyl ethyl ketone and ethyl alcohol; and (b) a second coating of a solution of catalyzed organic-soluble aliphatic polyisocyanate, applied as a crosslinker and immobilizer.
References Cited (Backward Citations)
US4801475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |