US4907764A (Expired)
1993-08-09
PAYMENT
Year of Fee Payment 4
1998-02-12
MAINTENANCE FEE REMINDER MAILED
1998-03-15
FOR FAILURE TO PAY MAINTENANCE FEES
1998-05-26
-EXPIRED DUE TO FAILURE TO PAY MAINTENANCE FEE
Effective DATE 19980318
2018-01-30
ON STATUS: PATENT DISCONTINUATION
Free Format Text PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
