by 
BabyRoo
ANSWERS: 4
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I think it depends on what is being patented. For instance, pharmaceutical patents don't seem to last very long at all. I took a class called "Drugs, Politics, and Culture" a few years ago and we discussed the difference between prescription and generic/OTC medications. The reason why Claritin and Zyrtec are OTC now is that the patents for both drugs expired. In order for the drugs to maintain prescription-only status, the company that produces those drugs would have to change the drug formula enough to merit a new patent. At least, that's my understanding of it. But, in other spheres, I imagine patents last quite a long time. I doubt there have been patents that completely replaced the original patents that led to the development of cars and televisions, for instance.
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I'm pretty sure all patents last for 20 years. I think the 20 years starts when the application process starts -- when you submit your application to the United States Patent and Trademark Office (USPTO). This is why it seems like some patents last longer than others. Some patents have longer filing periods and there are complications.
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The time frame has changed over time, but currently it is 20 years.
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"A U.S. utility patent, explained above, is generally granted for 20 years from the date the patent application is filed; however, periodic fees are required to maintain the enforceability of the patent. A design patent is generally granted protection for 14 years measured from the date the design patent is granted.Jul 7, 2016"
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