Jul 1, 2025

US12345495 - Method of making a reliable gun

A gun has parts that slide past one another during operation. A coating is formed on at least a surface of a first part that contacts a second part. At least an upper layer of the coating is porous and comprises a thermoset polymer and a filler. One or both parts may be part of a gas-operated reloading mechanism. The coating prevents jamming by excluding particles, yielding to particles that still manage to intrude, and by providing a reservoir for lubricant. The coating reduces clearances, improves accuracy, and reduces operating temperatures. The coating excludes particles from the lubricant, effectively allowing a large volume of lubricant to be used without the drawback of trapping dirt and other contaminants in the lubricant.

Inventors: Andrew W. Suman
Filing date: 2023-01-26

firearmgunmechanismcoating

This patent describes a method for enhancing the reliability of firearms through a specialized coating on sliding metal parts, which includes a porous upper layer made of thermoset polymer and filler. The coating is designed to prevent jamming by excluding particles, improving lubrication retention, and reducing operating temperatures, ultimately enhancing accuracy and performance.

Claim 1

A gun, comprising: a first metal part and a second metal part that slide past one another; and a coating over a surface of the first metal part; wherein the coating comprises a porous upper layer; the porous upper layer comprises a thermoset polymer and a filler; and the porous upper layer has the property of taking up oil, retaining the oil, and expressing some of the oil under stresses induced by operating the gun; and wherein the coating further comprises a lower layer, and the lower layer has a porosity of 5% or less. a first metal part and a second metal part that slide past one another; and a coating over a surface of the first metal part; wherein the coating comprises a porous upper layer; the porous upper layer comprises a thermoset polymer and a filler; and the porous upper layer has the property of taking up oil, retaining the oil, and expressing some of the oil under stresses induced by operating the gun; and wherein the coating further comprises a lower layer, and the lower layer has a porosity of 5% or less.

Google Patents

https://patents.google.com/patent/US12345495

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12345495