Patents by Inventor Robert L. Grinstead

Robert L. Grinstead 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).

  • Publication number: 20250296423
    Abstract: A zero-emission configurable medium/heavy duty class electric truck is disclosed that uses high-voltage, battery-powered electrical energy for both motive power and auxiliary powered unit power. In embodiments, the electric truck includes a central frame having a pair of main frame rails configured to support at least two battery modules, a front subframe configured to support a front axle assembly and a cab, and a rear subframe configured to support at least one rear axle assembly and a rear payload module selected from one of the set of multiple configurable rear payload modules.
    Type: Application
    Filed: June 9, 2025
    Publication date: September 25, 2025
    Inventors: Robert L. Grinstead, William Brandt
  • Patent number: 12351014
    Abstract: A zero-emission configurable medium/heavy duty class electric truck is disclosed that uses high-voltage, battery-powered electrical energy for both motive power and auxiliary powered unit power. In embodiments, the electric truck includes a central frame having a pair of main frame rails configured to support at least two battery modules, a front subframe configured to support a front axle assembly and a cab, and a rear subframe configured to support at least one rear axle assembly and a rear payload module selected from one of the set of multiple configurable rear payload modules.
    Type: Grant
    Filed: August 4, 2022
    Date of Patent: July 8, 2025
    Assignee: Zeus Electric Chassis, Inc.
    Inventors: Robert L. Grinstead, William Brandt
  • Publication number: 20240208315
    Abstract: A universal chassis frame for medium-duty weight class electric trucks that interfaces with any of a set of multiple configurable rear payload modules. The universal chassis frame includes a central frame having a pair of main frame rails supporting at least two battery modules substantially within an intra-frame space defined between the pair of main frame rails and between at least a pair of cross members transversely interconnected to the pair of main frame rails. A front subframe supports a cab and includes a pair of upper frame members mounted directly above the main frame rails, and a front axle unit mounted under the front subframe. A rear subframe includes a common connection interface to any of the set of multiple configurable rear units and at least one rear axle unit mounted under the rear subframe. Each axle unit has a single electric motor powered by a battery management system.
    Type: Application
    Filed: May 19, 2022
    Publication date: June 27, 2024
    Inventor: Robert L. Grinstead
  • Patent number: 12005958
    Abstract: A universal chassis frame is disclosed having a ladder-frame construction configurable to position a rear axle(s) at variable distances from a back of a vehicle's cab to provide customized rail/bed lengths for different electric truck classes. The chassis frame includes a central frame having a pair of main frame rails to support at least two battery modules substantially within an intra-frame space. A front subframe supports the cab, a front portion including a pair of upper frame members mounted above the corresponding main frame rails, and a front axle unit mounted under the front subframe. A rear subframe supports at least one rear axle unit mounted under the rear subframe and any of multiple configurable rear payload units via a common connection interface affixable to the main frame rails so the rear subframe's location with respect to the main frame is longitudinally variable from the back of the cab.
    Type: Grant
    Filed: August 4, 2022
    Date of Patent: June 11, 2024
    Assignee: Zeus Electric Chassis, Inc.
    Inventor: Robert L. Grinstead
  • Publication number: 20230202280
    Abstract: A zero-emission configurable medium/heavy duty class electric truck is disclosed that uses high-voltage, battery-powered electrical energy for both motive power and auxiliary powered unit power. In embodiments, the electric truck includes a central frame having a pair of main frame rails configured to support at least two battery modules, a front subframe configured to support a front axle assembly and a cab, and a rear subframe configured to support at least one rear axle assembly and a rear payload module selected from one of the set of multiple configurable rear payload modules.
    Type: Application
    Filed: August 4, 2022
    Publication date: June 29, 2023
    Inventors: Robert L. Grinstead, William Brandt
  • Publication number: 20230202566
    Abstract: A universal chassis frame is disclosed having a ladder-frame construction that is configurable to position the rear axle(s) at variable set of preset distances from the back of the cab of the vehicle to provide for customized rail/bed lengths over a range of medium/heavy classes of electric trucks. In various embodiments, the chassis frame includes a central frame having a pair of main frame rails configured to support at least two battery modules substantially within an intra-frame space defined between the pair of main frame rails. A front subframe is configured to support a cab, the front portion including a pair of upper frame members mounted above the corresponding pair of the main frame rails, and a front axle unit mounted under the front subframe.
    Type: Application
    Filed: August 4, 2022
    Publication date: June 29, 2023
    Inventor: Robert L. Grinstead