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Bifocal lenses as a concept were not patented; there are dozens of patents related to bifocals, bifocal contacts, and processes to make bifocals.
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∙ 10y ago
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Patent number on antique ..how to look up the original patent?
If it is a U.S. patent, you can go to the USPTO website for patent searches and enter the number in "patent number search".
What is a patent pending or patent number notice?
Patent pending is a warning that a patent application has been filed. It is completely worthless until and unless a patent is actually issued for that invention. Patent number notice means a patent with that number was issued for the invention that is implemented in the product labeled with that number.
What is the patent number for printing braille?
the patent number is 5209584
What was the patent number for the mailbox?
There is no specific patent number for the mailbox.
What is a patent number?
A patent number is the code that helps identify an invention.
What is the US patent number for Humira?
The US patent number is US 7198789 B2.
What is a sentence with the word bifocals in it?
Please help me find my bifocals.
How do i find out when a patent number was registered?
You communicate with the Patent Office.
What is a sentence using the word bifocals?
The bifocals he bought were used. The lower lenses on my bifocals allow me to read more easily.
Who holds patent number 555408021?
There is no US patent 555408021. There is also no US patent 55408021.
What is the phone number of the Holland Patent Free Library in Holland Patent?
The phone number of the Holland Patent Free Library is: 315-865-5034.
Why are bifocals important?
because bifocals are still used today and without bifocals you would have to have 2 pairs of glasses that's why its Important
