US4139250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge display panel and method of manufacturing the same
Assignee: US Philips Corp
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Filing: 1977-12-01
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Granted: 1979-02-13
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Expires: 1997-12-01
Abstract
Abstract A vacuum-tight seal is produced between plate-shaped elements one of which is glass, of a gas discharge display device while maintaining such a pressure on the surface of the elements that they are brought in permanent contact with a spacing member which separates them. Furthermore, at least the glass face plate is preferably heated to such a high temperature that a possible elastic deformation of said element resulting from a pressure exerted on the surface thereof is converted into a plastic deformation.
Inventors
- 👤 Jacobus H. Jacobs
- 👤 Johannes van Esdonk
- 👤 Johannes P. T. Franssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:29
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/24; H01J9/26; H01J9/261
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
184 words
Method of manufacturing a gas discharge display panel comprising a first plate-shaped glass element, a second plate-shaped element, a spacing member intermediate said plate-shaped elements and a tubulation for exhausting and back-filling said panel, the method comprising the steps of assembling said plate-shaped elements and said intermediate spacing member, placing a heat fusible sealing material in contact with said plate-shaped elements along a closed path surrounding said spacing member, exerting a uniform pressure on the entire surface of at least one of the plate-shaped elements sufficient to elastically deform said plate-shaped element and to bring it into contact with the spacing member, heating the assembly to a temperature above the softening point of said sealing material but below the softening point of said plate-shaped glass element for a sufficient time to thereby form a vacuum-tight seal between the plate-shaped elements and convert the elastic deformation of said plate-shaped glass element obtained by the uniform pressure exerted on the surface thereof into a permanent deformation, evacuating and backfilling the space between said plate-shaped elements with an ionizable gas through said tubulation and sealing said tubulation.
Claim 2
Dependent Claim
184 words
Method of manufacturing a gas discharge display panel comprising a first plate-shaped glass element, a second plate-shaped element, a spacing member intermediate said plate-shaped elements and a tubulation for exhausting and back-filling said panel, the method comprising the steps of assembling said plate-shaped elements and said intermediate spacing member, placing a heat fusible sealing material in contact with said plate-shaped elements along a closed path surrounding said spacing member, exerting a uniform pressure on the entire surface of at least one of the plate-shaped elements sufficient to elastically deform said plate-shaped element and to bring it into contact with the spacing member, heating the assembly to a temperature above the softening point of said sealing material but below the softening point of said plate-shaped glass element for a sufficient time to thereby form a vacuum-tight seal between the plate-shaped elements and convert the elastic deformation of said plate-shaped glass element obtained by the uniform pressure exerted on the surface thereof into a permanent deformation, evacuating and backfilling the space between said plate-shaped elements with an ionizable gas through said tubulation and sealing said tubulation.
Claim 3
Dependent Claim
40 words
Method of claim 1 wherein the step of exerting a pressure on the surfaces of the plate-shaped elements comprises reducing the pressure in the space between the plate-shaped elements during sealing to effectively maintain external pressure on said plate-shaped elements.
Claim 4
Dependent Claim
32 words
Method of claim 1 wherein the heating step comprises heating the assembly to a temperature which is approximately equal to the temperature at the lowest strain point of the plate-shaped glass element.
Claim 5
Dependent Claim
32 words
Method of claim 2 wherein the heating step comprises heating the assembly to a temperature which is approximately equal to the temperature at the lowest strain point of the plate-shaped glass element.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |