Patents by Inventor Piero Mulas

Piero Mulas 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).

  • Device for forming of thermoplastic products equipped with undercuts
    Patent number: 4822270
    Abstract: Apparatus for molding a thermoplastic tubular product such as a bushing having an internally threaded major diameter portion and an integral truncated minor diameter portion. A mold provided with a mold shell which jointly with a two-part mold core defines a mold cavity having a shape complementary to the shape of the molded bushing. The molded bushing has an internal undercut in the form of a thread in the major diameter portion thereof. The mold core is made as a core pin and an externally threaded sleeve of greater diameter than the core pin circumferentially of a portion of the core pin. Provision is made for moving the mold elements relatively to define the mold cavity and to effectively release the core by axial compression of the molded product while exposed on the mold core to cause it to swell radially outwardly and release the externally threaded core which forms the internal thread on the molded bushing.
    Type: Grant
    Filed: June 6, 1987
    Date of Patent: April 18, 1989
    Assignee: F. I. P. Formatura Iniezione Polimeri S.p.A.
    Inventors: Giancarlo Bonissone, Piero Mulas
  • Ball valve provided with a lock ring
    Patent number: 4605199
    Abstract: A ball valve having a valve body within which is provided a ball for opening and closing the valve. The ball valve is constructed with bushings and lock rings arranged for ease of assembly and disassembly for inspection of the wear of internal ring seals. An internal lock ring is provided with recesses in an end face for receiving a tool which is part of the operating handle of the valve.
    Type: Grant
    Filed: September 12, 1984
    Date of Patent: August 12, 1986
    Assignee: F.I.P. Formatura Iniezione Polimeri, S.p.A.
    Inventors: Giancarlo Bonissone, Piero Mulas
  • Multi-component valve
    Patent number: 4476891
    Abstract: The invention relates to a valve which can be assembled in two directions at right angles. It has a valve body (20), two sleeves (21 and 22) for connection to two pipes, an obturator (10) and a spindle (11) for controlling the same.According to the invention the valve body (20) is divided in two halves (31 and 32) by a plane inclined at 45.degree. to the axis of the spindle (11) such that said two halves can be assembled either with the axes of the sleeves (21, 22) aligned or with the axes of such sleeves orientated at 90.degree. with respect to each other.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: October 16, 1984
    Inventors: Piero Mulas, Giancarlo Bonissone
  • Method and device for eliminating the feeder head portion injection moulding process
    Patent number: 4404160
    Abstract: The present invention relates to a method and the relative device for the effecting thereof, for eliminating the feeder head portion which results at the end of the injection moulding process for articles of thermoplastic material.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: September 13, 1983
    Assignee: F.I.P. Formatura Iniezione Polimeri S.p.A.
    Inventors: Giancarlo Bonissone, Piero Mulas
  • Method for obtaining a compound clamping ring and a compound clamping ring so obtained
    Patent number: 4140324
    Abstract: A clamping ring in a joint sleeve for pipes, with a compound structure comprising a metal tooth among synthetic material teeth on an inner surface of the ring. In this way said ring assures an efficient clamping effect, without the drawbacks met by hard metal rings with respect to synthetic material rings.
    Type: Grant
    Filed: December 13, 1976
    Date of Patent: February 20, 1979
    Assignee: F.I.P. Formatura Iniezione Polimeri S.p.A.
    Inventors: Piero Mulas, Carmelo Leoncini