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Questions tagged [expired-patent]

For questions involving expired patents.

3 questions with no upvoted or accepted answers
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Expiration of patent 5,580,417 as well as technology used in tensioning cap in Figure 5

My first question has to do with patent #5,580,417. I believe this patent is expired, but are there any other patents in force using the same technology? My second question is in regards to the ...
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Elevator driven by flat belt in EU

I am currently doing some research about elevators driven by flat belts. There seem to be a few patents regarding the use of flat belts for elevator suspension means. I found patents US8157058and ...
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Can fee related expired patent be renewed?

Does this mean patent is expired and I can manufacture the apparatus? can former patent owner renew it and how would it affect my production? 2014-04-08 Anticipated expiration 2019-10-31 ...