Abstract A water removable material ordinarily used as a brazing stop-off - i.e. to restrict the flow of a molten metal and thereby to prevent wetting of an underlying surface in a brazing or soldering process - has been found useful presently as a means to prevent oxidation of, or other damage to, terminal metallurgy of metallized glass components during protracted periods of baking, gas-filling and glass sealing processing incidental to fabrication of gas discharge display panel assemblies. The subject baking, gas-filling and sealing processing involves hours or even days of variant temperature treatment, which should be distinguished from seconds or at most minutes of brazing treatment. The protective function required of the water removable coating during this prolonged processing period is considered unique and eliminates certain application and removal process operations associated with the use of other protective media (e.g. sintered glass frit).
Inventors
👤 N Poley
👤 H Whitaker
👤 D Wilson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-09 14:22
CPC Classifications
H; H01; H01J; H01J11/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
A method of working and/or reworking steps of a gas discharge display panel assembly glass fusion sealing process, in which a sealed envelope containing a specific gas is formed by gas-filling and heat fusion processing of metallized glass components said metallization centrally encapsulated in a protective permanent dielectric film and including peripheral terminal connection sites requiring exposure to effect connection, said method comprising: selectively coating said terminal sites with a water removable brazing stop-off preparation useful to prevent oxidation of said sites during said gas-filling and fusion process handling; working or reworking said filling and fusion process steps; and removing said stop-off coating from said terminal sites with an application of water.
Claim 2
Dependent Claim
95 words
The method of claim 2 in which said brazing stop-off preparation is a mixture of aluminum oxide, nitrocellulose, butyl alcohol and butyl acetate formed by mixing equal parts of butyl alcohol and butyl acetate to form a solvent mixture and dissolving in a portion thereof nitrocellulose, in the proportion 0.08 pounds of nitrocellulose per gallon of the solvent mixture portion, yielding a binder mixture and adding to each 1000cc of the binder mixture 635 grams of aluminum oxide and diluting the resultant binder/aluminum oxide mixture with 705cc of the solvent mixture per 1,000cc of binder.
Claim 3
Dependent Claim
27 words
The method of claim 2 in which said water removal step includes agitating the said coating by rubbing or brushing while rinsing the coating with running water.