From the standpoint of the manufacturer, one decided advantage

of the policy of having all problems worked out within the
plant is that the results secured are not divulged, but are
stored away in the laboratory archives and become part of the
assets and working capital of the corporation which has paid
for them; and it is usually not until patent applications are
filed that this knowledge, generally only partially and
imperfectly, becomes publicly known
From the standpoint of the manufacturer, one decided advantage
of the policy of having all problems worked out within the
plant is that the results secured are not divulged, but are
stored away in the laboratory archives and become part of the
assets and working capital of the corporation which has paid
for them; and it is usually not until patent applications are
filed that this knowledge, generally only partially and
imperfectly, becomes publicly known. When it is not deemed
necessary to take out patents, such knowledge is often
permanently buried.