Insulating product and its manufacture

• US 3,042,578 A
• Filed: 09/19/1955
• Issued: 07/03/1962
• Est. Priority Date: 09/19/1955
• Status: Expired due to Term

• Current Assignee: Paul S. Denning
• Original Assignee: Paul S. Denning
• Inventors: Denning, Paul S.
• Application Number:
  US03/535,305
• Time in Patent Office: 2,479 Days
• US Class Current: 162/171
• CPC Class Codes: B28B 1/52 specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cementby wrapping on to mandrels B28B1/42
• CPC Class Codes: C04B 14/185 expanded
• CPC Class Codes: C04B 14/40 Asbestos
• CPC Class Codes: C04B 22/08 Acids or salts thereof C04B22/0013 takes precedence
• CPC Class Codes: C04B 24/36 Bituminous materials, e.g. tar, pitch C04B24/243 takes precedence
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 30/02 containing fibrous materials
• CPC Class Codes: D21F 11/04 paper or board consisting on two or more layers
• CPC Class Codes: D21H 17/69 modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
• CPC Class Codes: E04C 2/16 of fibres, chips, vegetable stems, or the like
• CPC Class Codes: F16L 59/029 layered
• CPC Class Codes: Y10S 106/02 Perlite

Claims

25. A MOLDED LIGHT WEIGHT INSULATING MATERIAL CONSISTING ESSENTIALLY OF PARTICLES OF EXPANDED PERLITE SOME OF WHICH ARE AS FINE AS 100 MESH IN SIZE, THE PERLITE PARTICLES BEING IN SUBSTANTIAL CONTACT, SAID CONTACT BEING CHARACTERIZED BY POINT CONTACT AS DISTINGUISHED FROM SURFACE CONTACT, THEREBY LEAVING A MULTITUDE OF CONNECTING INTERSTICES BETWEEN THE PARTICLES, AND A MINOR AMOUNT OF SHORT FIBER LYING IN SAID INTERSTICES AND CONSTITUTING A FIBER NETWORK TO HOLD SAID PERLITE IN THE MOLDED SHAPE, AND A BINDING CONSTITUENT CONSISTING ESSENTIALLY OF ORGANIC MATERIAL.