Obviousness

Obviousness Analysis of US Patent 11,724,003 under 35 U.S.C. § 103

This analysis identifies combinations of prior art references that would render the claims of US Patent 11,724,003 (the '003 patent) obvious to a person having ordinary skill in the art (POSITA) at the time of the invention (priority date January 10, 2022). The motivation for combining these references will also be discussed.

Claim 1 Analysis

Claim 1 describes a firearm trigger mechanism comprising:

• A hammer with a sear catch and a hook for a disconnector, adapted to be pivoted rearward by a bolt carrier.
• A trigger member with a sear, contacted by the hammer during rearward pivoting to be forced to a set position.
• A disconnector with a hook for engaging the hammer.
• A locking member pivotable between a first position (blocking the trigger from moving to the released position) and a second position (allowing trigger movement), spring biased toward the first position, and moved to the second position by contact from the bolt carrier during forward movement when reaching an in-battery position.
• A three-position safety selector (safe, standard semi-automatic, forced reset semi-automatic).
• In standard semi-automatic position: rearward bolt carrier movement causes the disconnector hook to catch the hammer hook, requiring manual release of the trigger.
• In forced reset semi-automatic position: rearward bolt carrier movement forces the trigger to the set position, the safety selector prevents the disconnector hook from catching the hammer hook, and the user can pull the trigger without manual release when the bolt carrier is in-battery.

Prior Art References for Combination:

1. US Pat. Nos. 10,514,223 and 11,346,627 (referred to as "Reference A"): These patents disclose trigger mechanisms where the hammer forces the trigger to the set position, and a locking bar prevents early hammer release.
2. US Pat. Nos. 9,568,264; 9,816,772; and 9,939,221 issued to Thomas Allen Graves (referred to as "Reference B"): These patents describe devices for increasing the rate of semiautomatic fire by forcefully resetting the trigger through rigid mechanical contact between the trigger member and the bolt as the action cycles.
3. General knowledge in the art of firearm design (e.g., US Pat. Nos. 3,045,555A, 5,623,114A, 5,760,328A): These references demonstrate that multi-position selectors and mechanisms for altering the firing mode or rate of fire in firearms were well-known.

Combination and Motivation:

A POSITA, seeking to develop an improved semi-automatic firearm trigger mechanism that offers both standard and rapid-fire capabilities while ensuring safety, would be motivated to combine the teachings of Reference A, Reference B, and general knowledge of firearm design.

• Foundation for Reset and Safety (Reference A): A POSITA would start with a mechanism like that described in Reference A, which provides a reliable system for the hammer to force the trigger into its set position and includes a "locking bar" to prevent premature hammer release or "hammer follow" as the bolt cycles. This ensures the firearm is not discharged before the bolt is fully in battery, a critical safety feature. The mechanism for the locking member in Claim 1, which is spring-biased and released by the bolt carrier upon reaching the in-battery position, is functionally equivalent to the "locking bar" in Reference A designed to prevent early hammer release. The specific mechanical implementation would be an engineering design choice for a skilled artisan.

• Introducing Rapid-Fire Capability (Reference B): Recognizing the desire for increased rates of semi-automatic fire (as highlighted by the Graves patents, Reference B), the POSITA would be motivated to integrate a "forced reset" feature into the mechanism from Reference A. Reference B teaches the core concept of using the cycling action of the bolt to mechanically reset the trigger.

• Implementing Selectable Modes (General Knowledge): To provide versatility, the POSITA would then consider incorporating a multi-position safety selector into this combined mechanism, as such selectors are common in firearm design (Reference C). The selector would naturally include a "safe" position and a "standard semi-automatic" position, which would operate as described in Reference A (requiring manual trigger release due to disconnector engagement).

• Achieving Forced Reset Semi-Automatic Mode: To implement the rapid-fire "forced reset semi-automatic" mode, a POSITA would recognize that the disconnector's function (to prevent multiple shots on a single trigger pull) must be bypassed. The '003 patent itself explains that a standard disconnector "prevents the firearm from either firing multiple rounds on a single pull of the trigger, or from allowing the hammer or striker to simply 'follow' the bolt". Therefore, in a mode designed for rapid, forced-reset firing without manual release, disabling the disconnector would be an obvious design choice. The specific mechanism of the safety selector preventing the disconnector hook from catching the hammer hook (e.g., via a protuberance as described in Claim 2 and the detailed description) would be a straightforward engineering solution for a skilled artisan to implement this known function within a multi-position selector.

Thus, the combination of a trigger mechanism with hammer-forced reset and locking member (Reference A), the concept of bolt-actuated forced reset (Reference B), and the well-known practice of using multi-position selectors to control firing modes and disable specific components (general knowledge), would lead a POSITA to the claimed trigger mechanism of Claim 1. The specific three positions and the disconnector-disabling action in the forced reset mode are logical outcomes of combining these known elements to achieve the desired functionality.

Claims 2, 3, 5, 7, 8 Analysis

• Claim 2 & 5 (Protuberance on safety selector): These claims specify that the safety selector has a protuberance to contact the disconnector and prevent it from catching the hammer hook. As discussed above, the need to disable the disconnector in the forced reset mode is obvious, and a protuberance on a selector is a well-known mechanical means for achieving such an engagement or disengagement.
• Claim 3, 7, & 8 (Spring biasing trigger member): These claims describe a spring (specifically a compression spring) biasing the trigger member towards the set position. The use of springs to bias trigger components into their set or default positions is a fundamental and pervasive principle in firearm trigger mechanism design. This would be obvious to any POSITA designing a trigger.

Claim 4 Analysis (Drop-in Module)

Claim 4 describes the trigger mechanism as a self-contained module within a housing. The concept of a "drop-in" trigger group or module is well-established in the prior art. For example, U.S. Pat. No. 6,722,072B1 to McCormick specifically teaches a "Trigger group module for firearms and method for installing a trigger group in a firearm". Therefore, once the functional components of the trigger mechanism (as made obvious by the combination discussed for Claim 1) are known, it would be obvious for a POSITA to house them in a modular unit for ease of installation and interchangeability, especially in platforms like the AR-pattern firearm where such modules are common.

Claim 9 Analysis (Firearm)

Claim 9 describes a complete firearm incorporating the trigger mechanism. If the trigger mechanism itself, as defined in Claim 1, is rendered obvious by the prior art, then a firearm comprising such an obvious mechanism would also be obvious. The combination of known firearm components (receiver, bolt carrier) with an obvious trigger mechanism does not introduce any non-obvious features.

Claims 10, 11, 12, 13 Analysis

• Claim 10 (Housing with pins for hammer/trigger): This claim specifies a housing with aligned openings for hammer and trigger pins, with the hammer, trigger, and disconnector mounted on these pins. This is a common and obvious structural arrangement for a modular trigger mechanism, as taught by McCormick (US 6,722,072B1) and general knowledge in the art.
• Claim 11 (Housing pins coaxial with receiver pins): This claim details how the module's pins align with the receiver's assembly pin openings. This is a standard and obvious design requirement for any "drop-in" module to be compatible with an existing firearm receiver.
• Claim 12 & 13 (Spring biasing trigger member in housing): These claims further detail the spring biasing the trigger member, similar to Claims 3, 7, and 8, but specifying its placement within the housing. This is an obvious design choice for integrating the spring into the modular unit.

Claim 14 Analysis (Movably Mounted Locking Member)

Claim 14 is similar to Claim 1 but uses the broader term "movably mounted" for the locking member instead of "pivotable." Since a pivotable mounting is a specific type of movable mounting, if the pivotable locking member of Claim 1 is obvious, then a more generally movably mounted locking member performing the same function would also be obvious. The functional requirement of blocking and unblocking the trigger based on bolt carrier position remains the same, and various mechanical movements (pivoting, sliding, etc.) to achieve this are well within the skill of a POSITA.