Patent US4293376A successfully refreshed from Google Patents.
US4293376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing perforated glass plate
Assignee: Siemens AG
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Filing: 1979-01-24
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Granted: 1981-10-06
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Expires: 1999-01-24
Abstract
Abstract A perforated glass plate for use in gas discharge display devices is produced by providing an etch-resistant coating in a select pattern on surfaces of a glass plate so that areas to be perforated are coating-free, subjecting the so-coated glass plate to a gaseous hydrofluoric acid, obtained from concentrated hydrofluoric acid, for a period of time sufficient to etch fine sized perforations, for example holes, through the plate and rinsing the etched plates.
Inventors
- 👤 Kaspar Weingand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:41
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; C; C03; C03C; C03C15/00; H01J9/24; H01J9/26; H01J9/261; H01J2211/00; H01J2211/20; H01J2211/34; H01J2211/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A process for etching relatively fine size perforations in glass plates, comprising: coating opposite surfaces of glass plates with a select pattern composed of a hydrofluoric acid-resistant metal so that glass surface areas corresponding to desired locations of perforations are free of said resist metal; and etching perforations having an average depth dimension which is greater by a factor of at least two relative to the average lateral dimension thereof through the glass surface areas free of said resist metal by contacting said coated glass plates with a gas having hydrofluoric acid therein for a period of time sufficient to etch said perforations.
Claim 2
Dependent Claim
103 words
A process for etching relatively fine size perforations in glass plates, comprising: coating opposite surfaces of glass plates with a select pattern composed of a hydrofluoric acid-resistant metal so that glass surface areas corresponding to desired locations of perforations are free of said resist metal; and etching perforations having an average depth dimension which is greater by a factor of at least two relative to the average lateral dimension thereof through the glass surface areas free of said resist metal by contacting said coated glass plates with a gas having hydrofluoric acid therein for a period of time sufficient to etch said perforations.
Claim 3
Dependent Claim
37 words
A process as defined in claim 1 wherein said coated glass plates are contacted with a gas composed of a mixture of hydrofluoric acid and a protective gas selected from the group consisting of hydrogen and nitrogen.
Claim 4
Dependent Claim
34 words
A process as defined in claim 1 wherein a target mark is placed on a surface area of each of said glass plates and such target mark is not covered with said resist material.
Claim 5
Dependent Claim
145 words
A process for etching relatively fine size perforations in a glass plate, comprising coating opposite surfaces of glass plates with a select pattern composed of a hydrofluoric acid-resistant material so that glass surface areas corresponding to desired locations of perforations are free of said resist material, the outer surface of said resist material being composed of a metal and an inner layer of said resist material being composed of an adhesive layer composed of titanium provided between the surface of said glass plate and said resist material; and etching perforations having an average depth dimension which is greater by a factor of at least two relative to the average lateral dimension thereof through the glass surface areas free of said resist material by contacting said coated glass plates with a gas having hydrofluoric acid therein for a period of time sufficient to etch said perforations.
Claim 6
Dependent Claim
145 words
A process for etching relatively fine size perforations in a glass plate, comprising coating opposite surfaces of glass plates with a select pattern composed of a hydrofluoric acid-resistant material so that glass surface areas corresponding to desired locations of perforations are free of said resist material, the outer surface of said resist material being composed of a metal and an inner layer of said resist material being composed of an adhesive layer composed of titanium provided between the surface of said glass plate and said resist material; and etching perforations having an average depth dimension which is greater by a factor of at least two relative to the average lateral dimension thereof through the glass surface areas free of said resist material by contacting said coated glass plates with a gas having hydrofluoric acid therein for a period of time sufficient to etch said perforations.
Claim 7
Dependent Claim
12 words
A process as defined in claim 4 wherein said metal is copper.
References Cited (Backward Citations)
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |