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A comment on Solar sail (1980). Parent comment

Re:Solar sail (1980) by blakers95 on Sunday June 17, 2018 @10:58AM (#17332624)
This patent is from 1980--I don't think it's Google's.
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Re:Solar sail (1980) by zeth___ on Sunday June 17, 2018 @05:50PM (#17334527)
Patents expire after 26 years. Like sane copyright laws should.
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