Patents by Inventor Alexander Johnstone, Jr.

Alexander Johnstone, Jr. 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).

  • Slip tee pipe fitting
    Patent number: H176
    Abstract: A female tee pipe fitting has a stop only in one of its three openings, the other two coaxial openings which are perpendicular to the first opening have smooth inner surfaces and no stops. When two pipes are to be connected, one of the pipes is severed and a section of pipe removed leaving two free ends. A smooth opening of the female tee pipe fitting is slipped over one free end of the severed pipe and then slid out to slide over the other free end of the severed pipe. After the female tee has been centered, the second pipe is inserted within the opening of the female tee pipe fitting with the stop and the joints sealed.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: December 2, 1986
    Assignee: AT&T Bell Laboratories
    Inventor: Alexander Johnstone, Jr.