Patents Related to the Zbrojovka Brno vz. 22 Pistol

Czech Patent № 1862 (corresponds to German Patent № 300159, filed 31 August 1915 and granted 26 September 1921): This patent represents a design for a rotating barrel with a helical guide on the bottom and two locking lugs, one on each side, which rotate into cuts in the slide to lock the action. A rotating trigger guard locks the slide to the frame.

Czech Patent № 3507 (corresponds to German Patent № 304293, filed 21 October 1916 and granted 2 June 1921): “Extractor for self-loading pistols with firing pin hole extending to the rear through the breech block.”

Czech Patent № 3508 (corresponds to U.S. Patent № 1427967, filed 16 June 1921 and granted 5 September 1922): “Recoil-loading pistol.” This patent covers the overall design, including the frame, slide, firing pin, lockwork, hammer, and safety. The illustrations show the pistol as manufactured by Mauser in 9mm Parabellum.

Czech Patent № 3869 (corresponds to U.S. Patent № 1413184, filed 16 June 1921 and granted 18 April 1922):  “Recoil-loading pistol.” This patent covers a hold-open mechanism for the slide, after the last round has been fired, including a bifurcated flat spring the lower portion of which serves as the magazine catch.

Czech Patent № 4475 (corresponds to U.S. Patent № 1413185, filed 16 June 1921 and granted 18 April 1922):  “Recoil-loading pistol.” This patent covers the design of the slide and frame which prevents the slide from leaving the frame to the rear, in the direction of the shooter, in the case of catastrophic failure.

Czech Patent № 4798 (corresponds to U.S. Patent № 1427966, filed 16 June 1921 and granted 5 September 1922):  “Recoil-loading pistol.” This patent covers the method of locking the slide to the frame with a transverse pin with a sliding cover that locks into place on the side of the frame.

German patent № 365866. “Bolt for self-loading pistols with a bolt slide guided on the grip.” This is merely a supplementary patent to German patent № 300159, and is a refinement that allows for the use of small caliber, less-powerful cartridges, which will still operate the unlocking mechanism.