Failure to pay maintenance fees is reported in the USPTO's CD product
CASSIS-BIB as E1, E2, or E3 under "status." If a patent is subsequently
revived, it is reported as R1, R2 or R3. I don't know what lags there
might be, either between the formal lapse date and the appearance in the
database, or between the actual revival and its appearance in the
database.
Mary Ellen Mogee, Ph.D.
President, Mogee Research & Analysis, LLC
11701 Bowman Green Drive
Reston, Virginia, 20190-3501 USA
t: +1-703-478-2827
f: +1-703-478-3253
w: www.mogee.com
Transforming patent information into profit
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