US4895599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating for VDT screens
Assignee: Individual
•
Filing: 1988-08-09
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Granted: 1990-01-23
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Expires: 2008-08-09
Abstract
Abstract A liquid composition for application as a coating to screens of video display terminals (VDT's). The composition comprises a mixture of pure silica as a flattening agent, a surface active copolymer to minimize the build-up of static electricity on the surface of the screen, hydroxyethyl cellulose polymer as a thickener and glycerol as a carrier. The ingredients are present in relative concentrations so as to be effective for their intended purpose in the final mixture. The composition according to the present invention when applied as a coating to a VDT screen results in dispersion or defraction of light in a very effective manner, while at that same time reducing static electricity on the screen and cleaning the screen.
Inventors
- 👤 Paul Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:04
CPC Classifications
C; C09; C09G; C09G1/00; C09G1/06; C09G1/14; C09G1/16; H; H01; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/868; H01J29/88
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A liquid composition for application as a coating to screens of video display terminals, the composition comprising a mixture of: (a) pure silica as a flattening agent; (b) a surface active copolymer to minimize the build-up of static electricity on the surface of the screen selected from the group consisting essentially of dimethyl silicone polymers containing pendant polyether groups; (c) hydroxyethyl cellulose polymer as a thickener; and (d) a carrier comprising one of glycerol, ethylene glycol or propylene glycol; these ingredients being present in relative concentrations so as to be effective for their intended purpose in the final mixture.
Claim 2
Dependent Claim
99 words
A liquid composition for application as a coating to screens of video display terminals, the composition comprising a mixture of: (a) pure silica as a flattening agent; (b) a surface active copolymer to minimize the build-up of static electricity on the surface of the screen selected from the group consisting essentially of dimethyl silicone polymers containing pendant polyether groups; (c) hydroxyethyl cellulose polymer as a thickener; and (d) a carrier comprising one of glycerol, ethylene glycol or propylene glycol; these ingredients being present in relative concentrations so as to be effective for their intended purpose in the final mixture.
Claim 3
Dependent Claim
22 words
A composition according to claim 1 further comprising a sufficient amount of water so as to make the final composition cost effective.
Claim 4
Dependent Claim
46 words
A composition according to claim 1 wherein the ingredients are present in the following ranges (weight percent): (a) pure silica - 0.1% to 5.0% (b) surface active copolymer - 0.1% to 10.0% (c) glycerol - 10.0% to 99.0% (d) hydroxyethyl cellulose polymer - 0.1% to 10.0%.
Claim 5
Dependent Claim
52 words
A composition according to claim 2 wherein the ingredients are present in the following ranges (weight percent): (a) pure silica - 0.1% to 5.0% (b) surface active copolymer - 0.1% to 10.0% (c) glycerol - 10.0% to 99.0% (d) hydroxyethyl cellulose polymer - 0.1% to 10.0%. (e) water - 0.1% to 75.0%
Claim 6
Dependent Claim
38 words
A composition according to claim 1 wherein the silica has a lightweight, dry, powdered-like texture and an agglomerate particle size average of about 4 micrometers and a particle size range of between about 2 to about 10 micrometers.
Claim 7
Dependent Claim
25 words
A composition according to claim 1 wherein the glycerol is used a the carrier and is a purified commercial product containing at least 95% glycerol.
Claim 8
Dependent Claim
43 words
A composition according to claim 1 wherein the silica has a lightweight, dry, powdered-like texture and an agglomerate particle size average of about 4 micrometers; and the carrier is glycerol in the form of a purified commercial product containing at least 95% glycerol.
Claim 9
Dependent Claim
46 words
A composition according to claim 7 wherein the ingredients are present in the following ranges (weight percent): (a) pure silica - 0.1% to 5.0% (b) surface active copolymer - 0.1% to 10.0% (c) glycerol - 10.0% to 99.0% (d) hydroxyethyl cellulose polymer - 0.1% to 10.0%.
Claim 10
Dependent Claim
9 words
A composition according to claim 7, further comprising water.
Claim 11
Dependent Claim
51 words
A composition according to claim 9 wherein the ingredients are present in the following weight ranges: (a) pure silica - 0.1% to 5.0% (b) surface active copolymer - 0.1% to 10.0% (c) glycerol - 10.0% to 99.0% (d) hydroxyethyl cellulose polymer - 0.1% to 10.0%. (e) water - 0.1% to 75.0%
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |