METHOD OF PRODUCING ANTENNA TYPE WINDSHIELDS

• US 3,779,878 A
• Filed: 10/27/1971
• Issued: 12/18/1973
• Est. Priority Date: 06/16/1969
• Status: Expired due to Term

• Current Assignee: LOF Glass Incorporated
• Original Assignee: George N. Thacker, Howard R. Swift, Ivan L. Soreghy, Lazarus D. Thomas, Paul T. Mattimoe, Theodore J. Motter
• Inventors: Swift, Howard R., Soreghy, Ivan L., Thacker, George N., Thomas, Lazarus D., Mattimoe, Paul T., Motter, Theodore J.
• Primary Examiner(s): Tufariello, T.
• Application Number:
  US05/193,227
• Time in Patent Office: 783 Days
• Field of Search: 117/62,64,212,227 219/543,547,203 29/625,628 204/140 343/872,873
• US Class Current: 205/149
• CPC Class Codes: B32B 17/10376 Laminated safety glass or glazing containing metal wires
• CPC Class Codes: B60J 1/02 arranged at the vehicle front , e.g. structure of the glazing, mounting of the glazing on windscreen mounted antenna wire H01Q1/1271
• CPC Class Codes: C03B 23/02 Re-forming glass sheets
• CPC Class Codes: H01B 1/00 Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens

Abstract

A laminated glass windshield having incorporated with it an antenna of tarnished silver that is produced by applying a silver-frit paste to a surface of one glass sheet in a pattern of thin lines extending horizontally across the upper portion of the sheet toward the middle and then downwardly into a crescent shaped figure, firing the applied pattern to the glass, and treating the lines of the pattern with sulfur. The lower edges of the plastic interlayer and the other glass sheet in the windshield are cut out to facilitate connection with a lead wire.

Claims

2. A method as defined in claim 1 in which said fired on pattern pretreated with a halogen element.

3. A method as defined in claim 1 in which said paste contains a halogen compound, is fired onto said glass, and said chemical darkening comprises exposing said fired on halogen containing paste to the action of a sulfur compound.

4. A method as defined in claim 1 in which said fired on pattern is pretreated by spraying the same with a solution of 0.05 percent to 0.5 percent iodine with concentrated hydrochloric acid in isopropyl alcohol, and said sulfur treatment comprises spraying said pretreated pattern with a 1 percent to 10 percent solution of sodium sulfide in water.

5. A method as defined in claim 4 in which said solution of sodium sulfide contains from 5 percent to 10 percent of a metal compound.

6. A method as defined in claim 1 in which from 3 percent to 10 percent of silver iodide is added to said paste before it is applied, and said sulfur treatment comprises spraying said fired pattern with a solution of sodium sulfide.

7. A method as defined in claim 1 in which said circuit is darkened by an electro-chemical treatment comprising contacting the same with an electrolyte including the sulphur darkening agent, making said conducting material the anode and said electrolyte the cathode, and passing an electric current therebetween.

8. A method as defined in claim 1 in which said sulfur treatment comprises contacting said fired pattern with a stabilized sodium polysulfide solution.

9. A method as defined in claim 1 in which said sulfur treatment comprises exposing said conducting material to a mixture of sulfur and carbon.

10. A method as defined in claim 1 in which said structure is an automobile windshield, said conducting material is applied in a linear antenna pattern terminating in a relatively broad figure at the lower edge of said glass sheet, the lines of said pattern are protected from abrasion by assembling said glass sheet with a corresponding second glass sheet and an interposed layer of plastic covering said lines but having cutout portions therein corresponding in size shape and location to the figure on said first glass sheet.