To put it better:
Zeiss knew what to do, but had no industrial process for mass-producing
multicoated lenses at affordable cost. So Zeiss used their expensive process
for small production of multicoated lenses for military and scientific
applications only.
When Asahi Opt.Co,. became aware of that during the cooperation with Zeiss,
they developed the manufacturing technology for mass-producing multicoated
lenses at affordable cost, based on patents by OCLI.
So Asahi could apply the Zeiss knowledge and Zeiss could use the Asahi
industrial process.
Most other manufacturers paid royalties to Pentax for some time, except
Fujifilm, who developed their own EBC technology for applying multiple thin
layers.
Dario
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