Leif J HansenBerkeley, CA

4012072, Mar 15, 1977

Jan 19, 1976

5/650568

Leif A. Hansen - San Francisco CA

A47C 2700

297219

A cover for a bicycle seat which flexes with movements of the bicycle rider's legs to reduce or eliminate relative movement between the cover and the leg. The cover includes recess means adapted to accept a plurality of different padding inserts to produce a composite seat of any desired firmness and flexibility. The cover has a plurality of substantially longitudinally disposed grooves and raised portions which serve the dual functions of increasing air circulation between the seat cover and body of the rider and of providing an accordian-like movement with the up and down movements of the rider's legs to substantially reduce or eliminate relative movement between the seat cover and the legs of the rider.

4499893, Feb 19, 1985

Sep 29, 1982

6/426370

Arlon J. Hunt - Oakland CA
Leif J. Hansen - Berkeley CA
David B. Evans - Orinda CA

The United States of America as represented by the United States
Department of Energy - Washington DC

F24J 302

126449

A receiver for converting solar energy to heat a gas to temperatures from 700. degree. -900. degree. C. The receiver is formed to minimize impingement of radiation on the walls and to provide maximum heating at and near the entry of the gas exit. Also, the receiver is formed to provide controlled movement of the gas to be heated to minimize wall temperatures. The receiver is designed for use with gas containing fine heat absorbing particles, such as carbon particles.