Patent US4301197A successfully refreshed from Google Patents.
US4301197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane release surfaces on glass
Assignee: PPG Industries Inc
•
Filing: 1979-12-03
•
Granted: 1981-11-17
•
Expires: 1999-12-03
Abstract
Abstract Highly efficient release surfaces on glass substrates prepared by treatment of the glass with poly alkyl hydrogen siloxane are disclosed.
Inventors
- 👤 Helmut Franz
- 👤 James H. Hanlon
- 👤 Lloyd G. Shick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:29
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C03C17/30; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
In a method of fabricating plastic material wherein the plastic contacts a surface of a rigid glass substrate from which the plastic must be released, the improvement which comprises treating the glass surface with a composition consisting essentially of a poly alkyl hydrogen siloxane to form a durable surface which releases said plastic.
Claim 2
Dependent Claim
53 words
In a method of fabricating plastic material wherein the plastic contacts a surface of a rigid glass substrate from which the plastic must be released, the improvement which comprises treating the glass surface with a composition consisting essentially of a poly alkyl hydrogen siloxane to form a durable surface which releases said plastic.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein the poly alkyl hydrogen siloxane is in solution in acidified alcohol.
Claim 4
Dependent Claim
21 words
The method according to claim 2, wherein the poly alkyl hydrogen siloxane is in solution in isopropanol which contains sulfuric acid.
Claim 5
Dependent Claim
33 words
The method according to claim 2, wherein the glass surface is treated with the poly alkyl hydrogen siloxane by wiping the glass surface with the solution and rinsing off the excess with water.
Claim 6
Dependent Claim
26 words
The method according to claim 4, wherein the poly alkyl hydrogen siloxane contains alkyl radicals selected from the group consisting of methyl, isopropyl and tertiary butyl.
Claim 7
Dependent Claim
26 words
The method according to claim 1, wherein the fabricating comprises a technique selected from the group consisting of press polishing, laminating, casting, reaction forming and stretching.
Claim 8
Dependent Claim
23 words
The method according to claim 1, wherein the plastic material is selected from the group consisting of acrylics, polycarbonates, polyvinyl acetals and polyurethanes.
References Cited (Backward Citations)
US2184876A
Cited
US2811408A
Cited
US3616839A
Cited
US3666614A
Cited
US3808077A
Cited
US4027072A
Cited
US3900617A
Cited
US4204025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |