US4482577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating process of elastomeric material
Assignee: LRC Products Ltd
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Filing: 1980-12-16
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Granted: 1984-11-13
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Expires: 2000-12-16
Abstract
Abstract A treatment of a shaped flexible elastomer item so as to form a coating of a hydrophilic polymer on the surface of the elastomer. The treatment encompasses cleaning of the elastomer surface, immersion of the elastomer in a concentrated solution of a strong acid such as sulphuric acid, washing, and subsequent dipping of the treated elastomer in a solution of an uncured hydrophilic polymer. The treated elastomer is then held at an elevated temperature for a period of time to cure the polymer coating and to bond the polymer coating to the elastomer.
Inventors
- 👤 Albert Goldstein
- 👤 Howard I. Podell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:10
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; A; A61; A61B; A61B42/00; A61L; A61L31/00; A61L31/08; A61L31/10; B; B05; B05D; B05D3/00; B05D3/10; B05D3/101; B05D7/00; B05D7/02; C08J7/04; C08J7/056; C08J2321/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A method of coating of a vulcanized latex rubber product, so as to coat a surface of the product with a hydrophilic poylmer comprising the following steps: (1) Clean the product surface by washing; (2) Immerse the product into a treatment solution of highly concentrated sulfuric acid solution of a concentration of at least substantially 95% concentration of sulfuric acid; (3) Remove the product from the said treatment solution; (4) Wash the product surface; (5) Immerse the product into a coating solution of a hydrophilic polymer; (6) Remove the product from the coating solution; and (7) Heat the coated product for a period of time; in which the said treatment solution of sulfuric acid is maintained at a temperature substantially below seventeen degrees Celsius so as to minimize a stiffening effect to the latex rubber product otherwise resulting from the action of the treatment solution on the said product.
Claim 2
Independent Claim
149 words
A method of coating of a vulcanized latex rubber product, so as to coat a surface of the product with a hydrophilic poylmer comprising the following steps: (1) Clean the product surface by washing; (2) Immerse the product into a treatment solution of highly concentrated sulfuric acid solution of a concentration of at least substantially 95% concentration of sulfuric acid; (3) Remove the product from the said treatment solution; (4) Wash the product surface; (5) Immerse the product into a coating solution of a hydrophilic polymer; (6) Remove the product from the coating solution; and (7) Heat the coated product for a period of time; in which the said treatment solution of sulfuric acid is maintained at a temperature substantially below seventeen degrees Celsius so as to minimize a stiffening effect to the latex rubber product otherwise resulting from the action of the treatment solution on the said product.
Claim 3
Dependent Claim
21 words
The method as described in claim 1, in which said treatment solution is maintained at a temperature below zero, degrees celsus.
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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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |