US4816333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica coating
Assignee: 3M Co
•
Filing: 1986-09-19
•
Granted: 1989-03-28
•
Expires: 2006-09-19
Abstract
Abstract A coated article having a substrate coated with a layer of silica particles is provided. The coating is substantially uniform in thickness, adheres aggressively to the substrate, and provides excellent antireflection properties to the substrate.
Inventors
- 👤 Roger W. Lange
- 👤 Harold G. Sowman
- 👤 Soon-Kun Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:34
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/26; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31786
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
50 words
A coated article comprising a substrate having a coating of a continuous, gelled network of silica particles which coating is transparent, provides a substantially smooth surface is substantially uniform in thickness and is substantially permanently adhered to said substrate providing a 180° peelback value of at least about 500 g/cm.
Claim 2
Dependent Claim
50 words
A coated article comprising a substrate having a coating of a continuous, gelled network of silica particles which coating is transparent, provides a substantially smooth surface is substantially uniform in thickness and is substantially permanently adhered to said substrate providing a 180° peelback value of at least about 500 g/cm.
Claim 3
Dependent Claim
21 words
The coated article of claim 1 wherein said silica particles have a primary particle size of less than about 200 Å.
Claim 4
Dependent Claim
21 words
The coated article of claim 1 wherein said silica particles have a primary particle size of less than about 70 Å.
Claim 5
Dependent Claim
16 words
The coated article of claim 1 wherein said coating is about 20 to 500 nm thick.
Claim 6
Dependent Claim
32 words
The coated article of claim 1 wherein said coating is prepared from a colloidal solution capable of providing a dried product having an open porosity of between about 25 and 70 percent.
Claim 7
Dependent Claim
17 words
The coated article of claim 1 wherein said coating contains up to about 20 weight percent water.
Claim 8
Dependent Claim
11 words
The coated article of claim 1 wherein said substrate is transparent.
Claim 9
Dependent Claim
36 words
The coated article of claim 7 wherein the transmission therethrough of normal incident light in the wavelength range of 400 to 800 nm is increased over the transmission through an uncoated substrate of the same composition.
Claim 10
Dependent Claim
16 words
The coated article of claim 8 wherein said average transmission is increased at least 2 percent.
Claim 11
Dependent Claim
17 words
The coated article of claim 10 wherein said coating is from about 70 to 250 nm thick.
Claim 12
Dependent Claim
20 words
The coated article of claim 8 wherein said coating has an index of refraction of between about 1.15 and 1.40.
Claim 13
Dependent Claim
11 words
The coated article of claim 8 wherein said substrate is polymeric.
Claim 14
Dependent Claim
11 words
The coated article of claim 12 wherein said substrate is polyester.
Claim 15
Dependent Claim
12 words
The coated article of claim 13 wherein said substrate is polyethylene terephthalate.
Claim 16
Dependent Claim
13 words
The coated article of claim 1 wherein said coating further comprises polymeric binder.
Claim 17
Dependent Claim
12 words
The coated article of claim 1 wherein said coating further comprises surfactant.
Claim 18
Dependent Claim
67 words
An article comprising a polymeric substrate having a layer of a continuous, gelled network of silica particles, said particles having an average primary particle size of less than about 70 Å and forming a layer of substantially uniform thickness between abpit 70 to 250 nm thick and providing a transparent coating having a substantially smooth surface and a 180° peelback value of at least about 500 g/cm.
Claim 19
Dependent Claim
67 words
An article comprising a polymeric substrate having a layer of a continuous, gelled network of silica particles, said particles having an average primary particle size of less than about 70 Å and forming a layer of substantially uniform thickness between abpit 70 to 250 nm thick and providing a transparent coating having a substantially smooth surface and a 180° peelback value of at least about 500 g/cm.
Claim 20
Dependent Claim
16 words
The article of claim 17 wherein said gelled network is about 100 to 200 nm thick.
Claim 21
Dependent Claim
18 words
The article of claim 17 wherein said coating has an index of refraction between about 1.15 and 1.40.
Claim 22
Dependent Claim
32 words
The article of claim 17 wherein said gelled network is prepared from a colloidal solution capable of providing a dried product having an open porosity of from about 25 to 70 percent.
Claim 23
Dependent Claim
15 words
The article of claim 20 wherein said porosity is from about 30 to 60 percent.
Claim 24
Dependent Claim
17 words
The article of claim 17 wherein said gelled network contains up to about 20 weight percent water.
Claim 25
Dependent Claim
10 words
The article of claim 17 wherein said substrate is transparent.
Claim 26
Dependent Claim
10 words
The article of claim 17 wherein said substrate is polymeric.
Claim 27
Dependent Claim
10 words
The article of claim 24 wherein said substrate is polyester.
Claim 28
Dependent Claim
11 words
The article of claim 25 wherein said polyester is polyethylene terephthalate.
Claim 29
Dependent Claim
36 words
The article of claim 23 wherein the average transmission therethrough of normal incident light in the wavelength range of 400 to 800 nm is increased over the transmission through an uncoated substrate of the same material.
Claim 30
Dependent Claim
15 words
The article of claim 27 wherein said average transmission is increased at least 2 percent.
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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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |