Q: If the patent is from over 20 years ago, can one proceed with manufacturing a similar product?
A:
Assuming that you are correct that the patent is expired, then the smart move would be to look for newer patents to that cite the patent you have found. Tips on how to do that are at http://bit.ly/Patent_Searching. You may want to check for other patents on this product by checking the assignee database (explained in the slide set).
Good luck.
If you found this answer helpful, you may want to look at my answers to other questions about patent law are available at the bottom of my profile page at https://lawyers.justia.com/lawyer/kevin-e-flynn-880338
Kevin E Flynn
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