It is interesting, and in a way a bit sad, that highly competent firearms designers like T.C. Johnson, Pedersen, Searle and others were forced to labor under the shadow of John Browning, using many odd ways of doing things just to get around his patents.
Browning was what today we would call a "freelance" designer, selling his ideas to the company which would give him the best deal. Of course, Browning didn't draw up those patent applications himself. Colt, Winchester and FN were so eager to produce JMB's guns that when they bought a Browning design, they had lawyers literally working day and night to find and include patentable features. And Browning insisted that the patents be filed in his name, not the company's.
In recent days, a lot of publicity has been given to the Remington R51, a revival of the Model 51, a Pedersen design. And much has been made of its breech block, which acts as a short-stroke piston to operate the slide. A stroke of genius on the part of John P.? Yes, but he was forced to do something like that by the fact that the other John held the patent (drawn up by Colt) on an automatic pistol with the slide and breechblock in one piece! Searle's Savage design with its detachable breechblock is also considered a product of genius. But Searle had the same problem; he just solved it differently.
Jim