US4767671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated articles and methods for the preparation thereof
Assignee: Smith and Nephew PLC
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Filing: 1986-08-20
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Granted: 1988-08-30
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Expires: 2006-08-20
Abstract
Abstract Glass or plastics substrates which in use are susceptible to misting and which have on at least one surface thereof an antimist coating. The coating is formed from a hydrophilic polymer which comprises a hydrophilic polyurethane which contains from 35 to 60% by weight of water when hydrated and which has a thickness of from 3 μm to 50 μm in its anhydrous state. Substrates in which the coating comprises a first layer formed from a polyurethane which contains from 0 to 35% by weight of water when hydrated and in which a second and subsequent layers are formed from a polyurethane which contains 60 to 90% by weight of water are also described. Methods for forming the coatings are also described.
Inventors
- 👤 Robert S. R. Parker
- 👤 John G. B. Howes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:50
CPC Classifications
C; C09; C09D; C09D175/00; C09D175/04; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C03C17/322; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31554; Y10T428/31565; Y10T428/31598; Y10T428/31601; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A plastics substrate which in use is susceptible to misting which has on at least one surface thereof an antimist coating of a hydrophilic polymer in which the coating is formed from a hydrophilic polyurethane which contains from 35 to 60% by weight of water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state.
Claim 2
Dependent Claim
61 words
A plastics substrate which in use is susceptible to misting which has on at least one surface thereof an antimist coating of a hydrophilic polymer in which the coating is formed from a hydrophilic polyurethane which contains from 35 to 60% by weight of water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state.
Claim 3
Dependent Claim
15 words
A plastics substrate according to claim 1 in which the substrate is a polycarbonate film.
Claim 4
Dependent Claim
15 words
A plastics substrate according to claim 1 in which the substrate is a polyester film.
Claim 5
Dependent Claim
104 words
A plastics substrate which in use is susceptible to misting which has on at least one surface thereof an antimist coating of hydrophilic polymer in which the coating consists of at least two layers, the first layer adjacent to the substrate comprising a polyurethane which contains from 0 to 35% by weight of water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state and the second and subsequent layers comprising a polyurethane which contains from 60 to 90% by weight water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state.
Claim 6
Dependent Claim
104 words
A plastics substrate which in use is susceptible to misting which has on at least one surface thereof an antimist coating of hydrophilic polymer in which the coating consists of at least two layers, the first layer adjacent to the substrate comprising a polyurethane which contains from 0 to 35% by weight of water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state and the second and subsequent layers comprising a polyurethane which contains from 60 to 90% by weight water when hydrated and has a thickness of 3 μm to 50 μm in its anhydrous state.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |