US4828880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings on glass
Assignee: Pilkington Group Ltd
•
Filing: 1987-12-21
•
Granted: 1989-05-09
•
Expires: 2007-12-21
Abstract
Abstract Coatings, which act as barrier layers to inhibit migration of alkali metal ions from a glass surface and/or act as color suppressing underlayers for overlying infra-red reflecting or electrically conducting layers, are deposited by pyrolysis of a gaseous mixture of a silane, an unsaturated hydrocarbon and carbon dioxide on a hot glass surface at a temperature of 600° C. to 750° C.
Inventors
- 👤 Michael S. Jenkins
- 👤 Andrew F. Simpson
- 👤 David A. Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:42
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/401; C03C17/3411; C03C17/3417
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
53 words
A process for forming an underlayer on a glass surface comprising directing on to the hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide thereby depositing a transparent layer containing silicon and oxygen on the glass surface.
Claim 2
Dependent Claim
53 words
A process for forming an underlayer on a glass surface comprising directing on to the hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide thereby depositing a transparent layer containing silicon and oxygen on the glass surface.
Claim 3
Dependent Claim
29 words
A process according to claim 1 which additionally comprises the step of applying a layer sensitive to the migration of alkali metal ions from the glass over the underlayer.
Claim 4
Dependent Claim
20 words
A process according to claim 1 which additionally comprises the step of depositing an infra-red reflecting layer over the underlayer.
Claim 5
Dependent Claim
20 words
A process according to claim 1 which additionally comprises the step of depositing an electrically conducting layer over the underlayer.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the unsaturated hydrocarbon compound used in depositing the underlayer is an olefin containing 2 to 4 carbon atoms.
Claim 7
Dependent Claim
13 words
A process according to claim 5 wherein the unsaturated hydrocarbon compound is ethylene.
Claim 8
Dependent Claim
89 words
A process according to claim 2 wherein the proportions of the component gases present in the gaseous mixture used to deposit the underlayer and the flow rate of the gaseous mixture over the hot glass surface are regulated to deposit an underlayer which has a thickness and refractive index such that the glass coated with the underlayer has a light transmission within 2% of the light transmission of the uncoated glass and which provides an effective barrier, as herein defined, to migration of alkali metal ions from the glass.
Claim 9
Dependent Claim
63 words
A process according to claim 3 wherein the proportions of the component gases present in the gaseous mixture used to deposit the underlayer and the flow rate of the gaseous mixture over the hot glass surface are regulated to deposit an underlayer having a thickness in the range 60 nm to 80 nm and a refractive index in the range 1.6 to 1.8.
Claim 10
Dependent Claim
32 words
A process according to claim 1 wherein the ratio of unsaturated hydrocarbon to silane in the gaseous mixture used to deposit the underlayer is in the range 2:1 to 5:1 by volume.
Claim 11
Dependent Claim
32 words
A process according to claim 1 wherein the ratio of carbon dioxide to silane in the gaseous mixture used to deposit the underlayer is in the range 2:1 to 8:1 by volume.
Claim 12
Dependent Claim
138 words
A process of forming an underlayer on a glass surface which underlayer acts as a barrier to migration of alkali metal ions from the glass comprising directing on to a hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide, the proportions of the component gases present in the gaseous mixture being regulated within the ranges unsaturated hydrocarbon to silane 1:1 to 8:1 and carbon dioxide to silane 1:1 to 20:1 whereby an underlayer is deposited which has a thickness and refractive index such that the glass coated with the underlayer has a light transmission within 2% of the light transmission of the uncoated glass and which provides an effective barrier, as herein defined, to migration of alkali metal ions from the glass.
Claim 13
Dependent Claim
138 words
A process of forming an underlayer on a glass surface which underlayer acts as a barrier to migration of alkali metal ions from the glass comprising directing on to a hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide, the proportions of the component gases present in the gaseous mixture being regulated within the ranges unsaturated hydrocarbon to silane 1:1 to 8:1 and carbon dioxide to silane 1:1 to 20:1 whereby an underlayer is deposited which has a thickness and refractive index such that the glass coated with the underlayer has a light transmission within 2% of the light transmission of the uncoated glass and which provides an effective barrier, as herein defined, to migration of alkali metal ions from the glass.
Claim 14
Dependent Claim
17 words
A process according to claim 11 wherein the glass has a thickness of up to 2 mm.
Claim 15
Dependent Claim
29 words
A process according to claim 12 which additionally comprises the step of applying a layer sensitive to the migration of alkali metal ions from the glass over the underlayer.
Claim 16
Dependent Claim
24 words
A process according to claim 12 wherein the unsaturated hydrocarbon used in depositing the underlayer is an olefin containing two to four carbon atoms.
Claim 17
Dependent Claim
12 words
A process according to claim 14 wherein the unsaturated hydrocarbon is ethylene.
Claim 18
Dependent Claim
102 words
A process of forming a colour suppressing underlayer on a glass surface comprising directing on to a hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide, the proportions of the component gases present in the gaseous mixture being regulated within the ranges unsaturated hydrocarbon to silane 1:1 to 8:1 and carbon dioxide to silane 1:1 to 20:1 whereby an underlayer having a thickness in the range 60 nm to 80 nm and a refractive index in the range 1.6 to 1.8 is deposited on the glass.
Claim 19
Dependent Claim
102 words
A process of forming a colour suppressing underlayer on a glass surface comprising directing on to a hot glass surface at a temperature of 600° C. to 750° C. a gaseous mixture of a silane, an unsaturated hydrocarbon compound and carbon dioxide, the proportions of the component gases present in the gaseous mixture being regulated within the ranges unsaturated hydrocarbon to silane 1:1 to 8:1 and carbon dioxide to silane 1:1 to 20:1 whereby an underlayer having a thickness in the range 60 nm to 80 nm and a refractive index in the range 1.6 to 1.8 is deposited on the glass.
Claim 20
Dependent Claim
20 words
A process according to claim 16 which additionally comprises the step of depositing an infra-red reflecting layer over the underlayer.
Claim 21
Dependent Claim
24 words
A process according to claim 16 wherein the unsaturated hydrocarbon used in depositing the underlayer is an olefin containing two to four carbon atoms.
Claim 22
Dependent Claim
13 words
A process according to claim 18 wherein the unsaturated hydrocarbon compound is ethylene.
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |