Patent US4657820A successfully refreshed from Google Patents.
US4657820A
Expired / Lapsed
US
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Plastic article containing a top coat comprising an albumin and polysaccharide mixture
Assignee: Biocoat Inc
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Filing: 1986-04-16
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Granted: 1987-04-14
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Expires: 2006-04-16
Abstract
Abstract Hydrophilic coating of plastics, particularly an enhanced aqueous solution of a polysaccharide which flows uniformly over the surface of an anchor film applied to the plastic. The aqueous solution of a polysaccharide from the group consisting of hyaluronic acid and its salts, chondroitin sulfate and agarose is enhanced by the addition of albumin to provide uniform wetting over the anchor film on the plastic.
Inventors
- 👤 Gregory Halpern
- 👤 Jack U. Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:40
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/34; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/056; C09; C09D; C09D105/00; C09D105/08; C08J2433/00; C08J2433/04; C08J2433/06; C08J2433/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31754
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
43 words
A plastic object coated with: (a) an acrylic polymer solution permitted to dry as an anchor coat, and (b) an aqueous solution containing 1% sodium hyaluronate, and 0.1 to 15% albumin w/w on said hyaluronate, applied as a top-coat to said anchor coat.
Claim 2
Dependent Claim
43 words
A plastic object coated with: (a) an acrylic polymer solution permitted to dry as an anchor coat, and (b) an aqueous solution containing 1% sodium hyaluronate, and 0.1 to 15% albumin w/w on said hyaluronate, applied as a top-coat to said anchor coat.
Claim 3
Dependent Claim
27 words
A plastic object coated as in claim 1, wherein the acrylic polymer solution is 7.5 mole-percent hydroxyethyl methacrylate applied as a wet thickness of approximately 3 mils.
Claim 4
Dependent Claim
26 words
A plastic object, coated as in claim 2, wherein said aqueous solution is applied as a top-coat as a wet thickness of at least 3 mils.
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |