Airships International, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4402475 Thrusters for airship controlExpiredMay 20, 80Sep 06, 83[B64B]
4259776 Method of assembly of airship hullExpiredAug 09, 78Apr 07, 81[B23Q, B23P]
4208027 Gradation of skin thickness on metal-clad airship hullsExpiredAug 09, 78Jun 17, 80[B64B]

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