Title: Fan disturbing sand at the bottom of a body of water so that it may be pumped up efficiently

Abstract: A fan for use with pumps for pumping up sand from the bottom of a body of water having certain uniquely shaped vanes around the circumference of a truncated cone.

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Inventors: Araoka, Toshinobu

Application Number: 177893
Filing Date: 1971-09-02
Publication_date: 1976-03-23
Assignee:
Primary Class(es): 416/188 416/243
Other Classes:
US Patent Ref:

725818	Apr, 1903	Bates	37/67.
1316349	Sep, 1919	Calder	37/67.
1759490	May, 1930	Neveling	37/67.
1842537	Jan, 1932	Brunner	37/67.
2352394	Jun, 1944	Little	37/67.
2461311	Feb, 1949	Cushing et al.	37/67.
3148464	Sep, 1964	Jones	37/67.

Other Refs:
Primary Examiner: Crowder, Clifford D.
Assistant Examiner:
Attorney: Brisebois & Kruger