Patents by Inventor Erik Fohrman

Erik Fohrman 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).

  • Patent number: 11598619
    Abstract: The invention relates to a method of delaying a mechanism in a firearm and a delay unit for a projectile comprising i) a first and a second pressure chamber (3a, 3b) arranged to receive combustion gases in a firearm via at least one inlet (1a, 1b) arranged to each of said first and second pressure chambers (3a, 3b) following firing of a projectile ii) at least one outlet for transferring the combustion gases (4a, 4b), arranged to each of said first and second pressure chambers (3a, 3b), to a piston chamber in which a displaceable piston (6) is arranged dividing the piston chamber into a compartment (5b) having a volume V1 upstream the piston (6) and a compartment (5a) having a volume V2 downstream the piston (6), wherein said at least one outlet (4a, 4b) from the first and second pressure chambers (3a, 3b) are arranged to transfer said combustion gases to said compartments (5a, b) of said piston chamber to provide an overall pressure difference between compartments (5a) and (5b) pressing the piston (6) at an
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: March 7, 2023
    Assignee: SAAB AB
    Inventors: Michael Carlsson, Mats Runemård, Erik Fohrman, Owe Englund
  • Publication number: 20210356244
    Abstract: The invention relates to a method of delaying a mechanism in a firearm and a delay unit for a projectile comprising i) a first and a second pressure chamber (3a, 3b) arranged to receive combustion gases in a firearm via at least one inlet (1a, 1b) arranged to each of said first and second pressure chambers (3a, 3b) following firing of a projectile ii) at least one outlet for transferring the combustion gases (4a, 4b), arranged to each of said first and second pressure chambers (3a, 3b), to a piston chamber in which a displaceable piston (6) is arranged dividing the piston chamber into a compartment (5b) having a volume V1 upstream the piston (6) and a compartment (5a) having a volume V2 downstream the piston (6), wherein said at least one outlet (4a, 4b) from the first and second pressure chambers (3a, 3b) are arranged to transfer said combustion gases to said compartments (5a, b) of said piston chamber to provide an overall pressure difference between compartments (5a) and (5b) pressing the piston (6) at an
    Type: Application
    Filed: December 12, 2019
    Publication date: November 18, 2021
    Inventors: Michael CARLSSON, Mats RUNEMÅRD, Erik FOHRMAN, Owe ENGLUND
  • Publication number: 20150107350
    Abstract: The invention concerns a process for measuring the initial velocity V0 of an object that can be fired such as a shell or projectile that exits a barrel, said measurement being based on measurement of the force exerted on a sensor device (100) configured inside the object that can be fired, characterized in that the force is measured autonomously inside the object by detection of changes in shape of the sensor device (100) during movement of said object inside the barrel prior to its exit.
    Type: Application
    Filed: May 15, 2013
    Publication date: April 23, 2015
    Inventors: Erik Fohrman, Tony Holm
  • Patent number: 6170377
    Abstract: A method for contactless inductive transmission of programming data to a programmable time fuse included in a shell for a single shot, semi-automatic, or fully automatic shell firing barrel weapon. While the shell is situated in a cartridge chamber of a barrel of the weapon, data is transmitted to the programmable time fuse from a programming device of the weapon via a transmitting coil arranged around the cartridge chamber of the barrel to a receiving coil arranged in the shell. At least a part of the barrel lying between the coils is replaced by a non-magnetic material and designed so that it does not form an electrically conductive short circuited layer that would prevent transmission between the coils.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: January 9, 2001
    Assignee: Bofors AB
    Inventors: Rolf Larsson, Nils Johansson, Erik Fohrman, Björn Hagström, Sven-Åke Jern
  • Patent number: 6138547
    Abstract: A shell-firing barrel weapon system for a single shot, semi-automatic or fully automatic firing, including a rifled barrel comprising a programming member for programming with programming pulses fuses in shells fired from the weapon before or in conjunction with firing of the shells. At least one contact is located in the barrel of the weapon and connected to the programming member for transmitting a programming pulse from the programming member to the fuses of the shells. The at least one contact is electrically insulated from the barrel and protrudes into the barrel beyond bars of rifling of the barrel. An electrically conductive contact ring is concentrically arranged on the shells. The contact ring is electrically insulated from main parts of the shells and has an external diameter that is smaller than a diameter of the bars of the rifling of the barrel.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: October 31, 2000
    Assignee: Bofors AB
    Inventors: Rolf Larsson, Nils Johansson, Erik Fohrman, Bjorn Hagstrom, Sven-.ANG.ke Jern