Questions tagged [expired-patent]

For questions involving expired patents.

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Why Aren't Patent Expirations Listed for USPTO Gazette Vol. 1454 No. 2?

Reviewing 300+ issues of the Official Gazette Of The United States Patent And Trademark Office, from 2014 to present I noticed that only one issue — Vol. 1454 No. 2, from September 11th, 2018 — ...
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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 ...