Questions tagged [expired-patent]

For questions involving expired patents.

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6
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3answers
18k 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. ...
7
votes
3answers
20k views

What is a “Lapsed Patent” and which concepts (if any) may still be protected by this Patent?

US 6,148,942 "Infant stroller safely propelled by DC electronic motor" According to Google Patents, US 6,148,942 is Lapsed and according to Public PAIR its status is Expired as of 2008. Google ...
2
votes
1answer
144 views

Information regarding my father’s invention?

In reference to patent: US 2,768,768 A My late father, Vern L. Boven, is shown on this patent for the caulking gun from 1953. Does this mean that he was the inventor? If so, did he receive any ...
1
vote
2answers
1k views

Parent patent expired due to non-payment - are issued continuations still valid?

US patent 5938197 shows that it is expired due to non-payment (according to the search here: http://portal.uspto.gov/pair/PublicPair ). This patent has several children/continuations. Does the fact ...
1
vote
1answer
112 views

My grandfathers patent, expired?

In reference to the patent: US 948,162 A I'm wondering if this patent has expired, and the process to claim it? This is my great-grandfathers invention.
1
vote
1answer
247 views

What is the priority date of US 4,851,616 A?

What is the correct priority date of US 4,851,616 A, and what are the legal ramifications if an inventor deliberately misrepresents the priority date based on an error in the patent? Please provide ...