U.S. Pat. No. 3,501,191
by fros1y, published
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I've been uploading the PDF of the patent, rather than just a URL, but I'll see if there's a good stable link to the Google Patents page.
There are a number of rules that can impact exactly when a given patent expires. This can help for recent stuff: http://www.maxval-ip.com/paten....
asp. Conservatively -- and this is not legal advice -- you should be fine with anything that was filed before the 1980s.
One note if you're using Google Patents -- Google Patents searches both utility and design patents. Design patents have a shorter term, but could also have copyright issues th
at will linger for much longer. You can look to something like this for info: http://copyright.cornell.edu/r...
Let me know if you model anything cool!
Btw, how can I list all patents in google patent search which have been expired?
(I dont want to infect my mind with valid patents)
So its a crutch for chopsticks. Since then(1967) we learned how to eat in a chinese restaurant:)
Btw, could every of this silly patent have a number on it? It would be awesome to print a collection of it.
Maybe even a google url (but dunno if it will be available lets say in 5 year), or at least a google url in the description http://www.google.com/patents/... .
Nice work btw!
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