Patents by Inventor Calvin R. Johnson

Calvin R. Johnson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Phenolic resin coated proppants with reduced hydraulic fluid interaction
    Patent number: 5218038
    Abstract: The invention relates to the modification of a curable phenolic resin system by the incorporation of alkylphenol, alkoxyphenol, arylphenol or aryloxyphenol. The resulting resin has reduced water soluble leachates which, in turn, improves the break time when the resin is used to coat proppants for treating subterranean formations.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: June 8, 1993
    Assignee: Borden, Inc.
    Inventors: Calvin R. Johnson, Kwok-tuen Tse, Charles J. Korpics
  • Waler-stiffback bracket
    Patent number: 4054259
    Abstract: A bracket is provided including first and second elongated upper horizontal and lower upstanding flanges joined at adjacent inner and upper ends. The outer end of the first horizontal flange terminates in an upstanding waler retaining flange and the upper end of the waler retaining flanges terminates in an outwardly directed horizontal extension flange. The second upstanding flange is provided with an opening formed therethrough closely below the horizontal flange and rod tensioning structure is supported from the waler retaining flange on the outer side thereof for engaging and tensioning a rod projecting through the opening.
    Type: Grant
    Filed: May 14, 1976
    Date of Patent: October 18, 1977
    Inventor: Calvin R. Johnson
  • Convertible waler brace
    Patent number: 4003546
    Abstract: A waler brace or bracket is provided to be used for either a 3000-lb. forming system or a 5000-lb. forming system by accommodating either one 2.times.4 horizontal waler or a vertical stud in addition to a horizontal waler. The brace or bracket may be constructed so as to utilize a conventional sliding wedge lock or a conventional pivoted wedge lock and includes a base flange for abutting against the associated concrete form wall and a remote waler retaining flange adjustably shiftable for positioning at two different distances from the base flange. A first form of waler brace includes a slidably mounted waler retaining flange and a second form of the invention includes a pivoted waler retaining flange.
    Type: Grant
    Filed: August 6, 1975
    Date of Patent: January 18, 1977
    Inventor: Calvin R. Johnson
  • Tie rod with expandable locking cone
    Patent number: 3998424
    Abstract: A tie structure is provided for use in conjunction with concrete forms and includes structure whereby the form sections are prevented from collapsing inward until concrete is poured in the form. A first form of tie includes an expandable locking cone which may be expanded in diameter on the inner side of the form after the tie is placed in position in the form and as the locking lever of an associated waler bracket is moved to the applied position. A second form of tie construction utilizes an axially compressible and radially expandable sleeve for expansion in the tie opening formed in the concrete form.
    Type: Grant
    Filed: August 6, 1975
    Date of Patent: December 21, 1976
    Inventor: Calvin R. Johnson