Kodak’s ‘corona’ people where: Yost & Heidke — US3582333 as example
Yost & Willison — US3573916 as example
back around ’12 there was a corona discharge unit made by DIY — posted on YT
corona discharge has short utility as subbing — 24hrs or so. 
3M patents show using the corona to get the subbing started — 
— charge it
— coat with your gel+ components that aren’e light sensitive. this permits you to store a subbed roll for use later

corona discharge causes coating (partial reversal) problems in color materials if they are coated soon (an hour) after being charged. a Yost patent discusses.

an earlier, more fundamental approach is in
 PHOTOGRAPHIC FILM SUBBED WITH HARDENED GelatinGale F. Nadeau and Clemens B. Starck, Rochester, N. Y., assignors to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application September 16, 1939, Serial No. 295,268

Debunk: Who Made Matrix film? An absurd answer: US Military (army) . That is foolish; the military doesn’t make anything. Not the US military. They may contract for it from some private firm, such as Kodak, or Defender, or ANSCO, or DuPont, but they don’t make anything — not even bullets and boots.

Kilborne made CCA (Tampa) matrix film. Later, they coated Dr. Patterson’s (DTC; Houston) orthomatrix. It had too fine a grain. Matrix film should be a cubic grain, irregular distribution sizes for easier tanning. Defender /DuPont was an original maker of matrix emulsion. Technicolor purchased from Kodak. Fuji made matrix film .

Namedrop: Bob Pace. In NYC he printed for Penn; later he was at Graphic Process Co. (Hollywood) and Pace Color Prints. Then, at Frog Prince (San Francisco)

One place of learning: High School of Printing (49th Street)