Has ETH patented the 'Ceres' window-layout?

I think it came from the <ceres project>: the tiled windows,
on a two-thirds/one-third screen width split.

Plan9's acme, which was open-sourced as 'wily' copied this
most usefull configuration. Plan9 also copied other of the
brilliant HCI aspects of what became ETH-Oberon.

So if Plan9 was able to copy these well proven superior HCI
facilities, they can't be patented. So why did Wirth degenerate
to using M$loth's randondly allocated windows in Component
Pascal?

The heuristic auto-placement of newly opened viewers/windows
on the screen, instead of the stupid 'covering the previous viewer
with the newest one', helps reduce the chaos.