Questions tagged [us3516422]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers

US 20160206031 A1 is a patent that states its the only patent of its kind? Is this true?

But there is this US 3516422 A. Publication number US3516422 A Publication type Grant Publication date Jun 23, 1970 Filing date Jun 26, 1967 Priority date Jun 26, 1967 Inventors Alworth ...
user avatar