Patents Assigned to Crown Zellerbach Corporation
  • Web tensioning and steering
    Patent number: 3958736
    Abstract: Simultaneously tensioning one side of a web and correcting steering error introduced by said tensioning comprising passing the web partially around a tensioning member, e.g. a roll, and skewing the roll axis relative to a neutral axis, with the end of the roll adjacent the side of the web to be tensioned positioned, relative to the other end of the roll, toward the portion of the web wrapped around the roll and forward in the direction of web movement.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: May 25, 1976
    Assignee: Crown Zellerbach Corporation
    Inventor: Robert M. Pounds
  • Apparatus for continuously forming opposed C-shaped cuts in plastic film
    Patent number: 3956956
    Abstract: Opposed C-shaped cuts can be made in plastic film in a continuous manner by passing the film between a punch roll bearing specially designed punches and a mating roll having wells for receiving the punches. The special design of the punches overcomes the problem of stretching and tearing of the film normally encountered in attempting to make such cuts in plastic film using a rotary punch.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: May 18, 1976
    Assignee: Crown Zellerbach Corporation
    Inventor: Arthur Bert Bertholf
  • Pressure sensitive recording sheet
    Patent number: 3953642
    Abstract: A pressure sensitive recording sheet adapted for imaging under the pressure of a typewriter key or other writing instrument. The sheet comprises a ply of high surface area polyolefin fibers masking a colored medium therein. The ply of polyolefin fibers when subjected to the localized pressure of a writing instrument becomes relatively transparent in the region where the pressure is applied, to make distinct the colored medium distributed in the recording sheet.
    Type: Grant
    Filed: January 9, 1974
    Date of Patent: April 27, 1976
    Assignee: Crown Zellerbach Corporation
    Inventors: Dennis L. Forbess, John E. Hanby
  • Process for producing mercaptophenols
    Patent number: 3952064
    Abstract: A selective process for producing mercaptophenols is achieved by reducing the polysulfides which result from contacting phenols with sulfur chloride in a polar solvent reaction medium including a hydrogen chloride promoter, wherein the concentration of phenols is relatively dilute. The process selectivity promotes the sulfurization of phenols to polysulfides which are reducible to mercaptophenols.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: April 20, 1976
    Assignee: Crown Zellerbach Corporation
    Inventor: William G. Whalley
  • Method for forming containers with fin-type seams
    Patent number: 3935048
    Abstract: A conventional fin-type seam formed on tubed bag forming sheet material provided on one face with heat sealable material, has heat sealed overlapping edge portions forming the seam. The fin slides over a back-up plate extending between it and the body of the tube to prevent scuffing of the heat sealable material with consequent seal failure. A tracking wheel engaging the fin presses it against the back-up plate, and maintains alignment.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: January 27, 1976
    Assignee: Crown Zellerbach Corporation
    Inventor: George I. Rucker
  • Process for selectively producing 4,4-monothiodiphenolic compounds in high yields
    Patent number: 3931335
    Abstract: A process is provided for the formation of 4,4'-monothiodiphenolic compounds, in high yields, and in a selective manner, through the use of a novel reaction system. More specifically, a nonsterically hindered phenol and sulfur dichloride are reacted in the presence of initiation promoter and solvent portions, respectively, to produce the above 4,4'-monothiodiphenolic product.
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: January 6, 1976
    Assignee: Crown Zellerbach Corporation
    Inventors: Merle E. Cisney, Robert A. Damon