Patents by Inventor Donald J. Caldwell

Donald J. Caldwell 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: 20210242547
    Abstract: Disclosed is a lead acid battery including a housing having an exterior. The battery also includes a lead terminal extending through the housing to the exterior of the housing. A coating covers the lead terminal such that there is no exposed lead exterior to the housing.
    Type: Application
    Filed: April 20, 2021
    Publication date: August 5, 2021
    Inventors: Michael J. Koop, Donald J. Caldwell, Jason D. Fuhr, Jeffrey L. Troxel
  • Publication number: 20210005870
    Abstract: Disclosed is a battery having a conductive terminal extending beyond a surface of a battery cover, the conductive terminal having an internal portion and an external surface, wherein the internal portion comprises lead and external surface comprises a non-lead conductive material. Further disclosed is a method for producing such a battery.
    Type: Application
    Filed: September 23, 2020
    Publication date: January 7, 2021
    Inventors: Michael J. Koop, Donald J. Caldwell, Jason D. Fuhr, Jeffrey L. Troxel
  • Patent number: 10811667
    Abstract: Disclosed is a battery having a conductive terminal extending beyond a surface of a battery cover, the conductive terminal having an internal portion and an external surface, wherein the internal portion comprises lead and external surface comprises a non-lead conductive material. Further disclosed is a method for producing such a battery.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: October 20, 2020
    Assignees: Clarios Germany GmbH & Co. KGAA, CPS Technology Holdings LLC
    Inventors: Michael J. Koop, Donald J. Caldwell, Jason D. Fuhr, Jeffrey L. Troxel
  • Publication number: 20190273241
    Abstract: Disclosed is a battery having a conductive terminal extending beyond a surface of a battery cover, the conductive terminal having an internal portion and an external surface, wherein the internal portion comprises lead and external surface comprises a non-lead conductive material. Further disclosed is a method for producing such a battery.
    Type: Application
    Filed: March 5, 2019
    Publication date: September 5, 2019
    Inventors: Michael J. Koop, Donald J. Caldwell, Jason D. Fuhr, Jeffrey L. Troxel
  • Patent number: 5898108
    Abstract: An evaporative emission tester is used to evaluate the integrity of a vehicle's evaporative emission control system, including determining the system's purge capability. The emission tester performs a purge flow test to determine whether fuel vapor stored in the vehicle's evaporative canister and present in the fuel tank is being drawn into the engine for combustion at a minimum amount. The emission tester also performs a pressure test of the vehicle's evaporative canister purge system, which includes the fuel tank and lines. The emission tester can function as a stand-alone unit or as an integrated product with a host computer.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: April 27, 1999
    Assignee: Snap-on Technologies, Inc.
    Inventors: Daniel Mieczkowski, Mark J. Hasenberg, Thomas P. Becker, Matthew M. Crass, Robert D. Braun, Edward T. Gisske, Donald J. Caldwell
  • Patent number: 5763764
    Abstract: An evaporative emission tester is used to evaluate the integrity of a vehicle's evaporative emission control system, including determining the system's purge capability. The emission tester performs a purge flow test to determine whether fuel vapor stored in the vehicle's evaporative canister and present in the fuel tank is being drawn into the engine for combustion at a minimum amount. The emission tester also performs a pressure test of the vehicle's evaporative canister purge system, which includes the fuel tank and lines. The emission tester can function as a stand-alone unit or as an integrated product with a host computer.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: June 9, 1998
    Assignee: Snap-on Technologies, Inc.
    Inventors: Daniel Mieczkowski, Mark J. Hasenberg, Thomas P. Becker, Matthew M. Crass, Robert D. Braun, Edward T. Gisske, Donald J. Caldwell
  • Patent number: 4994890
    Abstract: The rectifier structure comprises a plurality of diodes including opposed first and second terminals. A plate electrically connects the first terminals to one another. A retainer locates the diodes on the plate. A plurality of individual links including an outer end portion, an inner end portion, and a fuse portion therebetween are located on the retainer such that the outer end portion of each link is in contact with the second terminal of a respective diode. A washer is in contact with the inner end portion of each link for electrically connecting the second terminals to one another. The links provide fuses for disconnecting the diodes from the washer when excessive current flows through a diode.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: February 19, 1991
    Assignee: Snap-on Tools Corporation
    Inventor: Donald J. Caldwell
  • Patent number: 4845792
    Abstract: An approach ramp for an automotive support platform includes first and second ramp members, the trailing end of the first ramp member being pivotally connected to the leading end of the platform. The second ramp member is both slidably and pivotally movable with respect to the first ramp member. Each ramp member carriers rollers at its leading end for engagement with the floor when the platform is lowered to an access position. In one configuration the ramp members are disposed in overlapping parallel relationship to define a single ramp incline. In a second configuration the second ramp member is extended from the first and is inclined with respect thereto to form a dual-slope ramp incline.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: July 11, 1989
    Assignee: Snap-on Tools Corporation
    Inventors: Gerald R. Bakula, Donald J. Caldwell, Andrzej J. Dlugolecki
  • Patent number: 4777852
    Abstract: The ratcheting screwdriver comprises a handle having a bore and a keyway substantially tangent thereto. In the bore is a gear and in the keyway are a pair of pawls which are movable individually into and out of engagement with the gear. An actuator is provided at the forward end of the handle to move these pawls. A cap operates the actuator.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: October 18, 1988
    Assignee: Snap-on Tools Corporation
    Inventors: Timm R. Herman, Donald J. Caldwell, Allan J. Bliemeister, Eric T. Gustafson, Mark S. Bakula
  • Patent number: D307236
    Type: Grant
    Filed: July 11, 1986
    Date of Patent: April 17, 1990
    Assignee: Snap-on Tools Corporation
    Inventors: Steven S. Cascio, Donald J. Caldwell, Tom S. Severson, Steven R. Wente, Mark S. Bakula
  • Patent number: D309246
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: July 17, 1990
    Assignee: Snap-on Tools Corporation
    Inventors: Steven S. Cascio, Donald J. Caldwell, Tom S. Severson, Steven R. Wente, Mark S. Bakula