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1answer
28 views

Patent No. USD513117 S1--Is this still a valid patent?

I'm trying to find out if this Patent No. USD513117 S1 is still valid. How can I find out for sure?
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2answers
29 views

Is this patent expired?

Is the USD388287 S patent expired? I am looking to design something similar to this.
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0answers
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What should I do with my late father's patents from the 1970's?

I have just come across this information on my late father's patent for an ice-making machine in the 1970's. I am his daughter, and was involved with his business Venturi Refrigeration before his ...
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3answers
1k views

Is an expired patent in the public domain?

From what I've been reading about US patents, once a patent has expired, it enters the public domain and can be freely used. The patent I was looking at was filed on 1/1999 and published in 10/2000. ...
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What is a “Lapsed Patent” and which concepts (if any) may still be protected by this Patent?

US6148942 "Infant stroller safely propelled by DC electronic motor" According to Google Patents the 6148942 patent is status Lapsed and according to Public PAIR its status is Expired as of 2008. ...