Patents by Inventor Stephen Donald Langdon
Stephen Donald Langdon 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).
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Patent number: 11768051Abstract: A multiple-shot crossbow includes a mainframe, a riser, upper and lower bow limbs and bowstrings, and a trigger mechanism. The mainframe includes upper and lower rails, each for supporting and guiding a corresponding bolt. The riser includes a passage for accommodating loading and launching a bolt. The bow limbs are attached to the riser and the bowstrings are attached to the bow limbs. Each bowstring is arranged independently to be drawn from a brace position to a drawn position and then return to the brace position while launching a bolt positioned on the corresponding rail. The lower bowstring is movable within a longitudinal slot between the upper and lower rails. The trigger mechanism is attached to a rear end of the mainframe and includes upper and lower trigger portions, each retaining a corresponding drawn bowstring and then releasing it upon actuation by a user.Type: GrantFiled: September 13, 2021Date of Patent: September 26, 2023Assignee: EXCALIBUR CROSSBOW, LLCInventors: Kyle William Egerdee, Stephen Donald Langdon, Cole J. Jessup, Robert G. Dykeman
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Publication number: 20210404762Abstract: A multiple-shot crossbow includes a mainframe, a riser, upper and lower bow limbs and bowstrings, and a trigger mechanism. The mainframe includes upper and lower rails, each for supporting and guiding a corresponding bolt. The riser includes a passage for accommodating loading and launching a bolt. The bow limbs are attached to the riser and the bowstrings are attached to the bow limbs. Each bowstring is arranged independently to be drawn from a brace position to a drawn position and then return to the brace position while launching a bolt positioned on the corresponding rail. The lower bowstring is movable within a longitudinal slot between the upper and lower rails. The trigger mechanism is attached to a rear end of the mainframe and includes upper and lower trigger portions, each retaining a corresponding drawn bowstring and then releasing it upon actuation by a user.Type: ApplicationFiled: September 13, 2021Publication date: December 30, 2021Inventors: Kyle William Egerdee, Stephen Donald Langdon, Cole J. Jessup, Robert G. Dykeman
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Patent number: 11143482Abstract: A multiple-shot crossbow includes a mainframe, a riser, upper and lower bow limbs and bowstrings, and a trigger mechanism. The mainframe includes upper and lower rails, each for supporting and guiding a corresponding bolt. The riser includes a passage for accommodating loading and launching a bolt. The bow limbs are attached to the riser and the bowstrings are attached to the bow limbs. Each bowstring is arranged independently to be drawn from a brace position to a drawn position and then return to the brace position while launching a bolt positioned on the corresponding rail. The lower bowstring is movable within a longitudinal slot between the upper and lower rails. The trigger mechanism is attached to a rear end of the mainframe and includes upper and lower trigger portions, each retaining a corresponding drawn bowstring and then releasing it upon actuation by a user.Type: GrantFiled: March 30, 2020Date of Patent: October 12, 2021Assignee: EXCALIBUR CROSSBOW, INC.Inventors: Kyle William Egerdee, Stephen Donald Langdon, Cole J. Jessup, Robert G. Dykeman
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Patent number: 11015892Abstract: An anti-dry-fire mechanism for a crossbow includes a slotted mainframe and a movable trigger subassembly engaged with the slot for bidirectional movement between brace and drawn positions. The movable subassembly includes a bowstring latch forward of a bowstring catch and biased toward a bolt-absent position in which the bowstring latch obstructs forward movement of the bowstring past the bowstring latch; in its bolt-present position the bowstring latch permits such movement. With the movable subassembly in the drawn position, a bolt loaded onto the mainframe holds the bowstring latch in its bolt-present position against its bias; with the movable subassembly in the drawn position and no bolt loaded, the bowstring latch is held in its bolt-absent position by its bias. With the movable subassembly in the brace position, engagement of the mainframe and bowstring latch holds the bowstring latch in its bolt-present position against its bias.Type: GrantFiled: April 26, 2020Date of Patent: May 25, 2021Assignee: EXCALIBUR CROSSBOW, INC.Inventors: Cole J. Jessup, Kyle William Egerdee, Stephen Donald Langdon
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Patent number: 10830553Abstract: A crossbow includes a rail assembly and a limb assembly that can be assembled together and disassembled from one another. A release member is rigidly attached to one assembly and a retention member is attached to the other assembly. When the crossbow is assembled the release member is in a retained position; when the crossbow is disassembled the release member is removed from its retained position. In a release position the retention member permits movement of the release member into or out of the retained position; in a retention position the retention member prevents movement of the release member out of the retained position. The release and/or retention members can be adjusted to alter the force urging together the rail and limb assemblies. The retention member can be moved between the release and retention positions without using any tool.Type: GrantFiled: December 18, 2018Date of Patent: November 10, 2020Assignee: EXCALIBUR CROSSBOW, INC.Inventors: Kyle William Egerdee, Stephen Donald Langdon
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Publication number: 20200224993Abstract: A multiple-shot crossbow includes a mainframe, a riser, upper and lower bow limbs and bowstrings, and a trigger mechanism. The mainframe includes upper and lower rails, each for supporting and guiding a corresponding bolt. The riser includes a passage for accommodating loading and launching a bolt. The bow limbs are attached to the riser and the bowstrings are attached to the bow limbs. Each bowstring is arranged independently to be drawn from a brace position to a drawn position and then return to the brace position while launching a bolt positioned on the corresponding rail. The lower bowstring is movable within a longitudinal slot between the upper and lower rails. The trigger mechanism is attached to a rear end of the mainframe and includes upper and lower trigger portions, each retaining a corresponding drawn bowstring and then releasing it upon actuation by a user.Type: ApplicationFiled: March 30, 2020Publication date: July 16, 2020Inventors: Kyle William Egerdee, Stephen Donald Langdon, Cole J. Jessup, Robert G. Dykeman
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Publication number: 20200191518Abstract: A crossbow includes a rail assembly and a limb assembly that can be assembled together and disassembled from one another. A release member is rigidly attached to one assembly and a retention member is attached to the other assembly. When the crossbow is assembled the release member is in a retained position; when the crossbow is disassembled the release member is removed from its retained position. In a release position the retention member permits movement of the release member into or out of the retained position; in a retention position the retention member prevents movement of the release member out of the retained position. The release and/or retention members can be adjusted to alter the force urging together the rail and limb assemblies. The retention member can be moved between the release and retention positions without using any tool.Type: ApplicationFiled: December 18, 2018Publication date: June 18, 2020Inventors: Kyle William Egerdee, Stephen Donald Langdon
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Patent number: 10041755Abstract: A safety device for a crossbow includes a wrist strap with a crank aperture in a palm portion thereof, and is secured around a user's wrist with the crank aperture over the palm of the user's hand. The crank aperture allows passage therethrough of a shaft of a crossbow crank, but prevents passage of a handle; wearing the wrist strap, the user can grasp the handle with the shaft extending through the crank aperture away from the palm of the user's hand. The wrist strap can be divided at its dorsal-wrist portion and include a closure to allow the wrist strap to be secured around or removed from the user's wrist as desired. Restraint of the crank handle by the crank aperture prevents uncontrolled spinning of the crossbow crank.Type: GrantFiled: October 19, 2017Date of Patent: August 7, 2018Assignee: EXCALIBUR CROSSBOW, INC.Inventors: Stephen Donald Langdon, Benjamin Dean Blosser
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Patent number: 9958232Abstract: An inventive mechanism includes stationary, reciprocating, winch, and stock subassemblies. The winch subassembly is mounted on the stock subassembly; the stationary subassembly is mounted at the rear of a slotted mainframe of the stock subassembly; the reciprocating subassembly moves along the mainframe between forward brace and rearward drawn positions. The winch subassembly takes up a rope to cause rearward movement of the reciprocating subassembly and lets out the rope to permit forward movement. The reciprocating subassembly includes a body engaged with the slot, a catch, and a sear. The stationary subassembly includes a trigger and an actuator. In the drawn position and retaining a bowstring, trigger movement causes actuator movement, which causes sear movement, which permits catch movement, which releases the bowstring. In its latched position, a trigger latch obstructs forward movement of the reciprocating subassembly from the drawn position; in its unlatched position, it permits that forward movement.Type: GrantFiled: October 15, 2017Date of Patent: May 1, 2018Assignee: EXCALIBUR CROSSBOW, INC.Inventors: Kyle William Egerdee, Stephen Donald Langdon, Benjamin Dean Blosser, Daniel Pierre Brassard