Helicopter rotors

Details Helicopter rotors Helicopter rotors

2007-10-31

2008-12-23

Rademaker, Charles A. (Department: 2916)

Transportation

Aircraft, spacecraft, or fuselage

Element or attachment

Design Patent

active

D0583297

CLAIM:
The ornamental design for helicopter rotors, as shown and described.

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Photographic prior art reference #1, helicopter.
Photographic prior art reference #2, helicopter displaying writing in French on the tail.
Photographic prior art reference #3, explanation of the function of the flybar.
Photographic prior art reference #4, toy helicopter, www.raidentech.com.
Photographic prior art reference #5, toy helicopter.
Photographic prior art reference #6, helicopter.
Photographic prior art reference #7, helicopter with M40297 or MA0297 displayed on the tail.
Photographic prior art reference #8, toy helicopter #AHS-23900, hstoy en.alibaba.com.
Photographic prior art reference #9, toy helicopter, toys999.en.alibaba.com.
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Mirick, Paul H. “A Comparison of Theory and Experiment for Coupled Rotor Body Stability of a Bearingless Rotor Model in Hover and Forward Flight”, Jun. 1, 1988, IP Document I

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