Re: OT: Clipping images from patent documents

On Tue, 17 Feb 2009 22:30:29 +0000, Chris Jones wrote:

My point is that a patent from the 1970s will have expired by now.

That depends upon whether it was filed in the 1970s or granted in the
1970s.

There are patents currently in force which were originally filed prior to
WW2. Once a patent is filed, the grant (and subsequent expiry) can be
delayed by continually submitting revisions. This is commonly termed a
"submarine" patent.

.

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