Search Results for: Optical elements any material
dialysis membrane, urinary catheter) (class / ) flexible web, sheet, film, or filament base (e.g., fabric, bandage, suture, transdermal patch, orthopedic cast tape) (class / ) plant member or animal specimen coating (class / ) radioactive base or coating (class / ) particles or nuclear reactor fuel elements
coated (class / ) fraud or tamper detecting (class / ) measuring, testing, or indicating (class / ) thickness or uniformity of thickness determined (class / ) frictional application (i.e., rubbing solid coating material on base) (class / ) spray coating utilizing flame or plasma heat (e.g., flame spraying...
https://patents.justia.com/patents-by-us-classification/427
discoveries. in , the first patent in north america was issued to samuel winslow by the general court of massachusetts for a new method of making salt. [ ] [ ] [ ] on april , , president george washington signed the patent act of ( stat. ) into law which proclaimed that patents were to be authorized for "any
useful art, manufacture, engine, machine, or device, or any improvement therein not before known or used." [ ] on july , , samuel hopkins of pittsford, vermont became the first person in the united states to file and to be granted a patent for an improved method of "making pot and pearl ashes." [ ]...
https://en.wikipedia.org/wiki/Timeline_of_United_States_inventions_(1946%E2%80%931991)