Primary Examiner — Tim R. Miles Attorney, Agent, or Firm — Polster, Lieder, Woodruff & Luc- chesi [57] ABSTRACT A humidifier is disclosed having a fine ...

A motor-fan unit comprising; an integrally expansion and static head chambers. formed frame having a central opening; a motor 9. In a multi-stage fan ...

4 shows a multi-stage fan system 301 comprising a first fan rotor 306 having a circumferential row of first stage fan blades 318 and driven by a first drive ...

UNITED STATES PATENT OFFICE 2037395 MULTISTAGE FAN Alfred E. Seelfe, New York, ... to thereby provide a multi-stage fan, having two or more 30 stage fans, ...

UNITED STATES PATENT OFFICE 20668 MULTISTAGE FAN Alfred E. Seelig, New York, ... to thereby provide a multi-stage fan, having two 30 or more stage fans, ...

25569 Reissued May 5, 1964 25569 MULTISTAGE FAN Ira Coron, Trotwood, ... fan having a relatively high output, such fans have been designed for high speed to ...

In the claims, the term "multistage" may refer to a two stage fan or to two stages of a fan having three or more stages. While embodiments of the invention ...

[0017] The invention may thus be seen to be a multistage turbine having at least one inlet stage fan blade formed of non-aircraft grade aluminum, ...