Patent US4913967A successfully refreshed from Google Patents.
US4913967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-fogging structural sheet
Assignee: Individual
•
Filing: 1987-01-02
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Granted: 1990-04-03
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Expires: 2007-01-02
Abstract
Abstract The present invention discloses a process for treating plastic structural sheets with a long lasting surfactant. The process encompasses exposing the surface of the sheet to a saturated solution of long lasting surfactant while the surface of the sheet is still tacky. A series of rollers forces the surfactant into the surface and distribute the surfactant uniformly across the sheet.
Inventors
- 👤 J. David Bilhorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:50
CPC Classifications
B; B05; B05D; B05D5/00; B05D7/00; B05D7/02; B05D7/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
78 words
A process for treating the surface of a plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, which comprises, exposing the surface of the sheet to a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure means to the surface of the sheet to force the surfactant into the surface of the sheet.
Claim 2
Dependent Claim
78 words
A process for treating the surface of a plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, which comprises, exposing the surface of the sheet to a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure means to the surface of the sheet to force the surfactant into the surface of the sheet.
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein the pressure means includes at least one roller to force the surfactant into the tacky sheet.
Claim 4
Dependent Claim
18 words
The process of claim 2, wherein at least one roller applies the surfactant simultaneously as pressure is applied.
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein the structural sheet is formed of polycarbonate material.
Claim 6
Dependent Claim
25 words
The process of claim 4, wherein a polycarbonate structural sheet has a co-extruded first surface and a second surface treated in accordance with claim 1.
Claim 7
Dependent Claim
30 words
The process of claim 1, wherein the pressure means includes a series of rollers which apply the surfactant to the sheet as the rollers force the surfactant into the surface.
Claim 8
Dependent Claim
22 words
The process of claim 1, wherein a series of rollers measure and apply a precise coating of surfactant to the structured sheet.
Claim 9
Dependent Claim
31 words
The process of claim 1, wherein the surfactant is applied to the structural sheet prior to the sheet cooling to a temperature of where the sheet sets into a solid state.
Claim 10
Dependent Claim
29 words
The process of claim 1, wherein the surfactant is applied to the structural sheet close to a die head which forms the sheet while the sheet is still tacky.
Claim 11
Dependent Claim
14 words
The process of claim 1, wherein the structural sheet is formed of acrylic material.
Claim 12
Dependent Claim
102 words
A process for treating the surface of a plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, which comprises, first, texturing the surface of the sheet by pin-striping the surface as the sheet exits the die head, then, coating the surface of the sheet with a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure to the surface of the sheet with at least one roller to further force the surfactant into the surface of the sheet.
Claim 13
Dependent Claim
102 words
A process for treating the surface of a plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, which comprises, first, texturing the surface of the sheet by pin-striping the surface as the sheet exits the die head, then, coating the surface of the sheet with a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure to the surface of the sheet with at least one roller to further force the surfactant into the surface of the sheet.
Claim 14
Dependent Claim
18 words
The process of claim 11, wherein the pressure is applied simultaneously to the sheet during the coating process.
Claim 15
Dependent Claim
14 words
The process of claim 11, wherein the pressure is applied after the coating process.
Claim 16
Dependent Claim
13 words
The process of claim 5, wherein the co-extruded first surface includes ultra-violet inhibitor.
Claim 17
Dependent Claim
77 words
A plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, prepared by a process comprising the steps of: exposing the surface of the sheet to a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure means to the surface of the sheet to force the surfactant into the surface of the sheet.
Claim 18
Dependent Claim
77 words
A plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, prepared by a process comprising the steps of: exposing the surface of the sheet to a saturated solution of long lasting surfactant while the surface of the sheet is still tacky, and providing pressure means to the surface of the sheet to force the surfactant into the surface of the sheet.
Claim 19
Dependent Claim
25 words
The plastic structural sheet according to claim 15, wherein the pressure means includes at least one roller to force the surfactant into the tacky sheet.
Claim 20
Dependent Claim
21 words
The plastic structural sheet according to claim 16, wherein at least one roller applies the surfactant simultaneously as pressure is applied.
Claim 21
Dependent Claim
17 words
The plastic structural sheet according to claim 15, wherein the structural sheet is formed of polycarbonate material.
Claim 22
Dependent Claim
101 words
A plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, prepared by a process comprising the steps of: first, texturing the surface of the sheet by pin-striping the surface as the sheet exits the die head; then, coating the surface of the sheet with a saturated solution of long lasting surfactant while the surface of the sheet is still tacky; and providing pressure to the surface of the sheet with at least one roller to further force the surfactant into the surface of the sheet.
Claim 23
Dependent Claim
101 words
A plastic structural sheet with a long lasting surfactant to increase the longevity of the anti-fogging and moisture dispersion characteristics the surfactant generates on the sheet, prepared by a process comprising the steps of: first, texturing the surface of the sheet by pin-striping the surface as the sheet exits the die head; then, coating the surface of the sheet with a saturated solution of long lasting surfactant while the surface of the sheet is still tacky; and providing pressure to the surface of the sheet with at least one roller to further force the surfactant into the surface of the sheet.
Claim 24
Dependent Claim
17 words
The plastic structural sheet according to claim 19, wherein the structural sheet is formed of polycarbonate material.
References Cited (Backward Citations)
US1674677A
Cited
US2400720A
Cited
GB1043272A
Cited
US3679531A
Cited
US4267215A
Cited
DE2802179A1
Cited
US4173490A
Cited
US4292773A
Cited
US4323597A
Cited
US4792492A
Cited
US4673708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |