Advanced Technology Institute of Commuter-Helicopter, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6231308 Rotor blade for rotary wing aircraftExpiredSep 08, 97May 15, 01[B63H]
6198991 Low-noise level landing apparatus and system for helicoptersExpiredFeb 16, 99Mar 06, 01[D05D]
5961290 Helicopter blade aerofoilExpiredFeb 13, 98Oct 05, 99[B63H]
5957662 helicopter blade aerofoilExpiredOct 17, 97Sep 28, 99[B64C]
5782433 Engine deceleration device and power transmission device for helicoptersExpiredMar 12, 96Jul 21, 98[B64C]
5655878 Higher harmonic control apparatus for a helicopter rotorExpiredFeb 21, 96Aug 12, 97[B64C]

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