Patent US4276350A successfully refreshed from Google Patents.
US4276350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon treatment for reducing the reactivity of a glass surface and product
Assignee: PPG Industries Inc
•
Filing: 1979-08-13
•
Granted: 1981-06-30
•
Expires: 1999-08-13
Abstract
Abstract A method is disclosed for reducing the reactivity of a glass surface by blocking reactive sites such as silanol groups at the glass surface with a molecular layer of fluorocarbon. The method involves adsorbing multivalent metal cations at the glass surface to provide anchoring sites for the chemisorption of otherwise nonreactive fluorocarbons.
Inventors
- 👤 Helmut Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:00
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A method for treating a glass surface comprising the steps of: a. contacting the glass surface with a solution comprising multivalent metal cations capable of adsorption onto the glass surface at a temperature below the boiling point of the solution; and b. contacting the glass surface, subsequent to the adsorption of the multivalent metal cations, with a fluorocarbon capable of chemisorption by the metal cation treated glass surface.
Claim 2
Independent Claim
68 words
A method for treating a glass surface comprising the steps of: a. contacting the glass surface with a solution comprising multivalent metal cations capable of adsorption onto the glass surface at a temperature below the boiling point of the solution; and b. contacting the glass surface, subsequent to the adsorption of the multivalent metal cations, with a fluorocarbon capable of chemisorption by the metal cation treated glass surface.
Claim 3
Dependent Claim
44 words
The method according to claim 1, wherein the glass surface is contacted with an aqueous solution of a salt containing multivalent cations of a metal selected from the group consisting of calcium, magnesium, barium, aluminum, strontium, chromium, copper, tin, iron, titanium, zirconium, and zinc.
Claim 4
Dependent Claim
21 words
The method according to claim 2 wherein the salt is selected from the group consisting of chromic, stannic and ferric chlorides.
Claim 5
Dependent Claim
14 words
The method according to claim 1 wherein the fluorocarbon is an ionic fluorocarbon surfactant.
Claim 6
Dependent Claim
13 words
The method according to claim 4, wherein the fluorocarbon surfactant contains carboxyl groups.
Claim 7
Dependent Claim
17 words
The method according to claim 5 wherein the fluorocarbon surfactant is an anionic, saturated, moderately carboxylated fluorocarbon.
Claim 8
Dependent Claim
13 words
The method according to claim 5 wherein the fluorocarbon surfactant is slightly unsaturated.
Claim 9
Dependent Claim
16 words
The method according to claim 7 wherein the fluorocarbon surfactant is a cationic, moderately carboxylated fluorocarbon.
Claim 10
Dependent Claim
16 words
The method according to claim 7 wherein the fluorocarbon surfactant is an amphoteric, heavily carboxylated fluorocarbon.
Claim 11
Dependent Claim
11 words
A glass article produced according to the method of claim 1.
References Cited (Backward Citations)
US3420693A
Cited
US3438760A
Cited
US3418153A
Cited
US3558345A
Cited
US3926604A
Cited
US4086178A
Cited
US4089804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |