Patents by Inventor Alvin G. Spence

Alvin G. Spence 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).

  • Multi-layer rotationally molded low permeation vessels and method for manufacture thereof
    Patent number: 8911842
    Abstract: A multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: December 16, 2014
    Assignee: Centro, Inc.
    Inventors: Alvin G. Spence, Jeremy R. Knepper, Daniel D. Grimes
  • Multi-layer rotationally molded low permeation vessels and method for manufacture thereof
    Patent number: 8721951
    Abstract: A method to form a multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: May 13, 2014
    Assignee: Centro, Inc.
    Inventors: Alvin G. Spence, Jeremy R. Knepper, Daniel D. Grimes
  • MULTI-LAYER ROTATIONALLY MOLDED LOW PERMEATION VESSELS AND METHOD FOR MANUFACTURE THEREOF
    Publication number: 20140048544
    Abstract: A multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Application
    Filed: October 18, 2013
    Publication date: February 20, 2014
    Applicant: Centro, Inc.
    Inventors: Alvin G. SPENCE, Jeremy R. KNEPPER, Daniel D. GRIMES
  • Multi-layer rotationally molded low permeation vessels and method for manufacture therof
    Patent number: 8597747
    Abstract: A multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: December 3, 2013
    Assignee: Centro, Inc.
    Inventors: Alvin G. Spence, Jeremy R. Knepper, Daniel D. Grimes
  • MULTI-LAYER ROTATIONALLY MOLDED LOW PERMEATION VESSELS AND METHOD FOR MANUFACTURE THEREOF
    Publication number: 20110250371
    Abstract: A method to form a multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Application
    Filed: June 22, 2011
    Publication date: October 13, 2011
    Applicant: CENTRO, INC.
    Inventors: Alvin G. Spence, Jeremy R. Knepper, Daniel D. Grimes
  • Multi-layer rotationally molded low permeation vessels and method for manufacture thereof
    Publication number: 20080145582
    Abstract: A multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
    Type: Application
    Filed: December 7, 2007
    Publication date: June 19, 2008
    Applicant: Centro, Inc.
    Inventors: Alvin G. Spence, Jeremy R. Knepper, Daniel D. Grimes