US4186221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying glass layers to polycarbonate
Assignee: General Electric Co
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Filing: 1978-11-13
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Granted: 1980-01-29
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Expires: 1998-11-13
Abstract
Abstract A method of providing a uniform and tenaciously adhered hard inorganic glass layer on a polycarbonate substrate which comprises vaporizing the glass in vacuum and precipitating said glass on the polycarbonate substrate using radio frequency induction heating means to vaporize said glass.
Inventors
- 👤 Walter L. Hall
- 👤 James S. Humphrey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:44
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26; C23C14/06; C23C14/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A method of providing an adherent thin glass film of uniform thickness on a polycarbonate substrate which comprises the steps of: (i) producing a stream of vaporized glass by heating a source of glass by radio frequency induction in an evacuated chamber; and, (ii) passing a polycarbonate substrate through said stream of vaporized glass with the longitudinal axis of said substrate transverse to said stream of vaporized glass such that said stream of vaporized glass contacts and is uniformly deposited on the polycarbonate substrate surface exposed thereto.
Claim 2
Independent Claim
87 words
A method of providing an adherent thin glass film of uniform thickness on a polycarbonate substrate which comprises the steps of: (i) producing a stream of vaporized glass by heating a source of glass by radio frequency induction in an evacuated chamber; and, (ii) passing a polycarbonate substrate through said stream of vaporized glass with the longitudinal axis of said substrate transverse to said stream of vaporized glass such that said stream of vaporized glass contacts and is uniformly deposited on the polycarbonate substrate surface exposed thereto.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein said evacuated chamber is maintained at a pressure of from about 10 -4 to about 10 -6 mm Hg.
Claim 4
Dependent Claim
16 words
The method according to claim 1 wherein oxygen is introduced into said stream of vaporized glass.
Claim 5
Dependent Claim
31 words
The method according to claim 1 wherein the thickness of the glass film is varied by varying the rate of passage of said polycarbonate substrate through said stream of vaporized glass.
Claim 6
Dependent Claim
21 words
The method according to claim 4 wherein the thickness of said glass film ranges from about 1 to about 10 microns.
Claim 7
Dependent Claim
17 words
The method according to claim 1 wherein said glass film is comprised substantially of SiO 2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |