"ESU" flying ring

Details "ESU" flying ring "ESU" flying ring

1988-01-27

1989-08-08

Hafer, Robert A.

Amusement devices: toys

Aerodynamically supported or retarded

Spinning disc

446 34, 273425, 244 34A, D21 3, D21 50, A63H 2700, B64C 300, A63B 6510

Patent

active

048549070

ABSTRACT:
A flying ring of symmetrical cross section featuring a normal leading edge with triangular cross section. The triangle is isosceles and the sides of the triangle may be concave. As the ring is symmetrical, it may be used with "either side up".

REFERENCES:
patent: 18980 (1889-04-01), Goldman
patent: D241565 (1976-09-01), Molenaar
patent: 248901 (1881-11-01), Wetherill
patent: D253004 (1979-09-01), Meckstroth
patent: 281773 (1883-07-01), Mann
patent: 429531 (1890-06-01), Johnstone
patent: 678265 (1901-07-01), Low
patent: 1986937 (1935-01-01), MacGregor
patent: 1991689 (1935-02-01), McClintock
patent: 3312472 (1967-04-01), Kerr
patent: 3566532 (1971-03-01), Wilson
patent: 3590518 (1971-07-01), LeBaron
patent: 3765122 (1973-10-01), English
patent: 4063382 (1977-12-01), McCallum
patent: 4174834 (1979-11-01), De Martino
patent: 4204680 (1980-05-01), Brown
patent: 4456265 (1984-06-01), Adler
patent: 4560358 (1985-12-01), Adler

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