Electron beam milling of electrical coatings

• US 3,375,342 A
• Filed: 09/21/1964
• Issued: 03/26/1968
• Est. Priority Date: 03/04/1963
• Status: Expired due to Term

• Current Assignee: Preston Robinson
• Original Assignee: Preston Robinson
• Inventors: Robinson, Preston
• Application Number:
  US04/397,979
• Time in Patent Office: 1,282 Days
• US Class Current: 219/69.17
• CPC Class Codes: B23K 15/08 Removing material, e.g. by cutting, by hole drilling
• CPC Class Codes: B24B 19/024 on electrical resistances
• CPC Class Codes: H01C 17/04 adapted for winding the resistive element
• CPC Class Codes: H01C 17/24 by removing or adding resistive material H01C17/23, H01C17/232, H01C17/235 take precedence
• CPC Class Codes: H01J 37/30 Electron-beam or ion-beam tubes for localised treatment of objects
• CPC Class Codes: Y10T 29/49099 Coating resistive material on a base
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.

Claims

2. A PROCESS FOR PREPARING AN ELECTRIC CIRCUIT MEMBER, COMPRISING PROVIDING A CERAMIC SUPPORT CARRYING A THIN ELECTRICALLY CONDUCTIVE COATING FILM, MILLING OUT A LINEAR GAP IN THE FILM AT A SPEED OF AT LEAST ABOUT 100 INCHES PER MINUTE, THE MILLING BEING EFFECTED WITH A FOCUSED 15 TO 20 KILOVOLT ELECTRON BEAM THAT LEAVES THE MILLED GAP WITH MICROSCOPICALLY STRAIGHT EDGES AND AT THE SAME TIME GLAZES THE SURFACE OF THE CERAMIC EXPOSED AT THE GAP.