Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 8181563 | Gas tappet system for a rifle A gas tappet system for use in an M16, M4, or AR-15 type rifle having a detachable piston eccentrically connected to an operating rod. A piston having a plenum therein and a releasably attached operating rod uses combustion or propellant gasses to move the piston in... | 05/22/2012 |
| 8161864 | Firearm gas piston operating system A gas piston operating system for an autoloading firearm. The gas piston system may include a barrel having a longitudinally-extending bullet pathway, a gas block defining a piston bore, a passageway fluidly connecting the bore with the bullet pathway for diverting ... | 04/24/2012 |
| 8141474 | Charging mechanism for gas powered firearms An improved mechanism for charging a gas powered firearm, especially with regard to the Kalashnikov variants of rifles known as AK-47s, comprising a modified gas tube having a lateral aperture formed into its left side, a semi-cylindrical sleeve suitably adapted to ... | 03/27/2012 |
| 7975596 | Firearm An improvement to a firearm of the character having an upper receiver, an operating rod operably associated with the upper receiver for movement between a first position and a second position, and a lower receiver connected to the upper receiver. The improvement con... | 07/12/2011 |
| 7971518 | Direct drive retrofit for rifles A direct drive retrofit system for use with an M-16 or AR-15 rifle for conversion from an impingement system comprising: a gas block, the gas block having a barrel bore and a gas plug bore; a gas plug, the gas plug being inserted into the gas plug bore from the muzz... | 07/05/2011 |
| 7832326 | Auto-loading firearm with gas piston facility A firearm has a body with a bolt assembly reciprocating within the body. A barrel having a bore extends from the body. A gas block with an elongated chamber is connected to the barrel, and a gas passage connects the barrel bore to the gas block chamber. An operating... | 11/16/2010 |
| 7739939 | Direct drive retrofit for rifles A direct drive retrofit system for use with an M-16 or AR-15 rifle for conversion from an impingement system comprising: a gas block, the gas block having a barrel bore and a gas plug bore; a gas plug, the gas plug being inserted into the gas plug bore from the muzz... | 06/22/2010 |
| 7698987 | Heavy caliber firearm with enhanced recoil and control characteristics The invention comprises an improved recoil control device comprising a bolt head and an inertia block for use in a variety of firearms. In one embodiment, the bolt head and inertia block are articulated so that the displacement of the bolt head results in a force co... | 04/20/2010 |
| 7469624 | Direct drive retrofit for rifles A direct drive retrofit system for use with an M-16 or AR-15 rifle for conversion from an impingement system comprising: a gas block, the gas block having a barrel bore and a gas plug bore; a gas plug, the gas plug being inserted into the gas plug bore from the muzz... | 12/30/2008 |
| 7461581 | Self-cleaning gas operating system for a firearm A self-cleaning gas operating system for a firearm having a conventional bolt carrier assembly is disclosed comprising: a nozzle assembly having a nozzle in direct communication with a port on the muzzle; said nozzle assembly nested within a piston cup having a vent... | 12/09/2008 |
| 7448307 | Gas operated semi-automatic rifle A gas operated semi-automatic rifle is disclosed having a forwardly moving gas piston located under the discharge end of a barrel. The gas piston is connected to a locking mechanism. The locking mechanism is engaged with a breechblock. As the gas piston moves a shor... | 11/11/2008 |
| 7343844 | Firearm recoil absorbing system An anti-recoil system for counteracting recoil in firearms and weapons using a gas actuated piston assembly is disclosed. A recoil piston is acted upon by gas pressure routed from the receiver/barrel. High pressure gas causes forward movement of the recoil piston th... | 03/18/2008 |
| 7340987 | Conversion platform for a .45 ACP pistol A method of modifying a .45 ACP pistol having a slide and a receiver defining a magazine well includes the steps of reducing the size of the magazine well and shortening the slide. The slide includes a breech face and a proximal end and the magazine well includes a ... | 03/11/2008 |
| 7316091 | Firearm bolt carrier with mechanical/gas key A firearm includes a barrel having an end coupled to a receiver. A reciprocating bolt carrier is carried by the receiver and movable between a locked position and an unlocked position. The bolt carrier includes a buttress formed in a top surface thereof. A key inclu... | 01/08/2008 |
| 7311032 | Firearms with gas pressure loading mechanisms Firearms employing gas pressure loading mechanisms are disclosed. An example firearm includes a single force receiving component containing a gas cylinder, and a barrel in communication with a cartridge chamber received in the force receiving component. The cartridg... | 12/25/2007 |
| 7302881 | Conversion kit and method for a ruger 10/22 semi-automatic .22 caliber rim fire rifle to shoot .17 mach 2 cartridges A conversion kit and method for converting the RUGER® 10/22® semi-automatic .22 caliber rim fire rifle to shoot .17 HM 2 cartridges utilizes the original bolt in the receiver and replaces the bolt operating handle with increased weight to replace the original bolt... | 12/04/2007 |
| 7261029 | Firearm bolt locking mechanism A firearm bolt locking mechanism includes a locking pin in the bolt carrier of a firearm like an AK-47 assault rifle or variant thereof. The locking pin is normally urged from the bolt carrier by a compressed spring. The mechanism also includes a pivot arm mounted o... | 08/28/2007 |
| 7240600 | Rifle charging handle with ambidextrous latch A charging handle for a rifle having a housing. The handle has a body with an elongated bar having a forward end and a rear end. The bar has a bolt engaging element at the forward end, and a crossbar having an intermediate portion connected to the rear end of the ba... | 07/10/2007 |
| 7237469 | Firearms having a locked breech Firearms having a locked breech are disclosed. An example firearm includes a barrel; a bolt head; a firing pin having a bulge; a bolt head carrier having a forward position and a rearward position; a central force receiving component receiving a rear end of the barr... | 07/03/2007 |
| 7162824 | Modular trigger group for firearms and trigger group installation method A module housing is adapted to be inserted into an operating position in the trigger group receiving area of a firearm. The module housing includes at least one pin receiver defined by two openings formed in the module housing, one on each lateral side of the housin... | 01/16/2007 |
| 7162822 | Collapsible buttstock for firearm A buttstock for a firearm having a buffer recoil mechanism is collapsible and adjustable. The buttstock includes a lower receiver extension having a bore therein that fits over the buffer recoil mechanism, the lower receiver extension being fixed to the buffer recoi... | 01/16/2007 |
| 7159505 | Hydraulic breech mechanism for firearms A hydraulic breech mechanism uses a sealed reservoir of fluid to rigidly support the bolt 6 against barrel 2 resisting pressure generated by discharging a cartridge in chamber 3. Recoil forces cause the high pressure cylinder 7 and barrel... | 01/09/2007 |
| 7131228 | Modular firearm An M-4 firearm having a lower receiver assembly and an upper receiver assembly. The upper receiver assembly is connected to the lower receiver assembly. The lower receiver assembly has a fire control assembly. The upper receiver assembly has a barrel and a hand guar... | 11/07/2006 |
| 7100318 | Adjustable firearm support The adjustable firearm support of present invention works in combination with a firearm stock having a butt pad bolt or a stock built of sufficient materials to fasten to utilizing a common threaded fastener. This adjustable firearm support includes a support rod, b... | 09/05/2006 |
| 7055276 | Harmonic damper to dampen firearm vibration A damper for reducing recoil and vibrations during and after firing a firearm may comprise a resilient member and a weight. The resilient member may mounted to a portion of a firearm having a surface suitable for engaging and retaining the resilient member therein, ... | 06/06/2006 |
| 7040213 | Firearm receiver system with belt-feed capability A firearm receiver system including a receiver body, an ammunition belt feeding assembly and a bolt carrier. The receiver body includes a first face and a second face approximately opposite the first face. The receiver body is configured for having means for trigger... | 05/09/2006 |
| 7036259 | Casing for firearms A casing for firearms, comprising a metal sleeve (15) on which is stably applied, through attachment means, a barrel (12), an inner element (14) made from polymeric material for the anchoring of said sleeve (15) and an outer shell (13 | 05/02/2006 |
| 6993864 | Locking block for compact semi-automatic pistols A locking block mechanism for a compact semiautomatic pistol includes a pair of forward guide rails, which are normally separate from the locking block. Additionally, the locking block includes transverse ribs on the sides of the locking block, which engage mating s... | 02/07/2006 |
| 6959509 | Quick change infinitely adjustable barrel nut assembly The present invention is a quick change and torque controlled barrel nut assembly for use on a variety of firearms. The invention is made up of a generally cylindrically shaped barrel nut configured to adaptably connect a barrel to a firearm, a gas tube ring that is... | 11/01/2005 |
| 6907687 | Over-and-under shotgun apparatus and method An over-and-under shotgun apparatus includes a radius track which serves as a hinge for articulating the barrel portion of the shotgun apparatus relative to the receiver/stock portion of the shotgun apparatus. The radius track is defined by a female or concave porti... | 06/21/2005 |
| 6848351 | Rifle A rifle with an upper receiver and a barrel attached to the upper receiver and including a bolt carrier, and operating, buffer, and cooling systems. The operating system includes a cylinder and a piston coupled to receive propelling gases from the barrel. As the pis... | 02/01/2005 |
| 6722255 | Apparatus and method for actuating a bolt carrier group of a receiver assembly An apparatus adapted for actuating a bolt carrier group apparatus comprising a piston tube attached to a receiver assembly. An operating rod is disposed in a bore of the piston tube. A piston is engaged with a first end of the operating rod. The operating rod moves ... | 04/20/2004 |
| 6681677 | Method of reconfiguring a firearm receiver system for receiving magazine-fed ammunition and belt-fed ammunition A method of reconfiguring a firearm receiver system comprises the operations of providing a substantially as-manufactured OEM lower receiver assembly capable of having an ammunition magazine attached thereto for communicating ammunition to an OEM upper re... | 01/27/2004 |
| 6679156 | Weapon with rotating barrel A weapon for firing a projectile is provided that includes a receiver within which is disposed a loading mechanism for loading and unloading the weapon. A feed system supplies the loading mechanism with ammunition and a firing mechanism releases the loadi... | 01/20/2004 |
| 6634274 | Firearm upper receiver assembly with ammunition belt feeding capability A firearm receiver system includes an upper receiver assembly capable of receiving magazine-fed ammunition and belt-fed ammunition. A lower receiver is attached to the upper receiver assembly. The lower receiver assembly is capable of having an ammunition... | 10/21/2003 |
| 6619592 | Self-actuating firearm A self-actuating firearm comprising a frame, a breechblock, a barrel provided with a bore, a cylinder which is associated with the barrel and forms an internal chamber which is connected to the bore of the barrel, by means of a gas tap, and a piston which... | 09/16/2003 |
| 6564691 | Semi-automatic gas-operated shotgun A semi-automatic, gas-operated shotgun having a side-loading port, lower barrel configuration with bottom shell ejection. Gas exit ports on the barrel operate a piston which actuates a connecting rod assembly rearwardly. The rearward movement of the conne... | 05/20/2003 |
| 6536324 | Anti-recoil device with brake, brake compensator and recuperator The invention relates to anti-recoil devices for guns and martars. The anti-recoil device has a brake with a principal cabity which houses a principal piston pierced with holes. The small chamber of the brake is connected by an opening to a subisdiary chamber ... | 03/25/2003 |
| 6516700 | Automatic weapon An automatic weapon has a housing 1 with a movable spring-mounted barrel assembly 6 having a barrel 7 and a receiver 8. The receiver 8 has a spring-mounted bolt support 24 with a bolt 27, a buffer mechanism 32 and a firing pin mechanism 33 having a movabl... | 02/11/2003 |
| 6508160 | Gas-flow device for automatic shotguns This is a gas-flow device for semiautomatic or automatic shotguns, which consists of a gas-flow cylinder, closed at the front part by a flange with gas discharge ports (17) around the ammunition magazine, opposite the cylinder, a circular valve (18) that ... | 01/21/2003 |
