It says lapsed for US6493686, but I do not understand why. Is this information up to date?

How can I determine the reason for this patent having lapsed, for example if it was abandoned for non-payment, where could I find that out?

  • yes it lapsed...
    – Pushpak
    May 31, 2015 at 5:05
  • possible duplicate of How do you determine a patent's expiration date?
    – Pushpak
    Jun 1, 2015 at 4:27
  • @Pushpak, please tell me if this is because of not being paid or by certain number of years. Also please tell me if the "also published as" will lapse by date next year in July due to 20yr rule. Thank you.
    – Jerry B
    Jun 2, 2015 at 19:16
  • Using method to locate information on USPTO PAIR a person can find out status as :- Patent Expired Due to NonPayment of Maintenance Fees Under 37 CFR 1.362; but you should know about family patent US5946673
    – Pushpak
    Jun 3, 2015 at 11:11

1 Answer 1


USPTO PAIR can be found at:- http://portal.uspto.gov/pair/PublicPair

put the patent number and select the corresponding radio button

review the information:-

For example your patent document was expired due to non payment, but its related patent application also called parent application was found to be active. therefore you should know about family patent US5946673;

Earlier an answer has been made to know about family patents See Find family memeber

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