Capped film resistors

• US 3,153,219 A
• Filed: 09/05/1961
• Issued: 10/13/1964
• Est. Priority Date: 09/05/1961
• Status: Expired due to Term

• Current Assignee: Frederick G. Street
• Original Assignee: Frederick G. Street
• Inventors: Street, Frederick G.
• Application Number:
  US04/136,011
• Time in Patent Office: 1,134 Days
• US Class Current: 338/273
• CPC Class Codes: H01C 1/148 the terminals embracing or surrounding the resistive element H01C1/142 takes precedence
• CPC Class Codes: H01C 17/28 adapted for applying terminals
• CPC Class Codes: H01C 7/00 Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material consisting of loose powdered or granular material H01C8/00; resistors having potential barriers, e.g. field-effect resistors, H01L29/00; semiconductor devices sensitive to electromagnetic or corpuscular radiation, e.g. photoresistors, H01L31/00; magnetic field controlled resistors H10N50/10; bulk negative resistance effect devices H10N80/00

Claims

1. A METAL OXIDE ELECTRICAL RESISTOR INCLUDING A ONEPIECE, SOLID CORE MADE OF ELECTRICALLY INSULATING MATERIAL AND OF CIRCULAR CROSS SECTION, THE CORE HAVING A FULL AND UNIFORM DIAMETER THROUGHOUT MOST OF ITS LENGTH AND HAVING RELATIVELY SHORT END PORTIONS THAT TAPER TO A SMALLER DIAMETER AND THEN FORM CIRC UMFERENT IAL SURFACES OF UNIFORM DIAMETER TO END FACES OF THE CORE, EACH OF THE END FACES OF THE CORE MERGING WITH THE ADJACENT SMALLER DIAMETER PORTION AROUND A BEVELED CORNER, METAL OXIDE ELECTRICAL RESISTANCE COATING OF SUBSTANTIALLY UNIFORM THICKNESS COVERING THE FULL DIAMETER, CONVERGING, REDUCED-DIAMETER AND BEVELED-CORNER SURFACES OF THE SOLID CORE, METAL END CAPS THAT FIT OVER THE RESISTANCE COATING ON THE REDUCEDDIAMETER PORTIONS OF THE CORE WITH A PRESS FIT WHEREBY SAID CAPS ARE SECURED TO THE OPPOSITE ENDS OF THE CORE BY FRICTION, THE WALL THICKNESS OF THE PARTS OF THE CAPS THAT FIT OVER THE REDUCED-DIAMETER PORTION OF THE CORE BEING SUBSTANTIALLY EQUAL TO THE DIFFERENCE IN THE RADIUS OF THE FULL DIAMETER AND REDUCED-DIAMETER PORTIONS OF THE CORE, ELECTRICALLY INSULATING MATERIAL COVERING THE ENTIRE OUTSIDE SURFACES OF THE CAPS AND THE COATED CORE BETWEEN THE CAPS, THE ELECTRICALLY INSULATING MATERIAL BEING OF SUBSTANTIALLY UNIFORM OUTSIDE DIAMETER, AND AN ELECTRICAL TERMINAL CONDUCTOR CONNECTED TO THE END OF EACH CAP ADJACENT TO THE AXIS OF THE CORE AND EXTENDING THROUGH AND BEYOND THE INSULATING MATERIAL THAT COVERS THE CAP.