James M Palmer

US Patent:

48486612, Jul 18, 1989

Filed:

Mar 24, 1988

Appl. No.:

7/172447

Inventors:

James D. Palmer - Phoenix AZ
Michael W. Stuart - Phoenix AZ

Assignee:

Stuart & Associates, Inc. - Phoenix AZ

International Classification:

B05B 1510

US Classification:

239204

Abstract:

A sprinkler head shutoff valve for use with underground lawn sprinkler systems includes a central housing including a lower water inlet port and an upper water exit port. The lower water entry port may include a threaded male fitting for threadedly engaging a conventional plastic tee or elbow connector of the type often used in underground sprinkling systems. The upper water exit port includes an internally threaded female fitting for engaging a conventional plastic riser tube interconnecting the shutoff valve to a sprinkler head. A spring-biased plunger is disposed within the housing for engaging a gasket encircling the water exit port to seal off the flow of water therethrough. A rod having a length slightly greater than that of the riser tube is inserted within the riser tube and depresses the plunger for allowing water to flow to the sprinkler head. If the sprinkler head is removed or is broken off, the rod is released, and the plunger advances to its sealed position and stops any further flow of water therethrough.

US Patent:

41885872, Feb 12, 1980

Filed:

Jun 26, 1978

Appl. No.:

5/918857

Inventors:

James R. Palmer - Mesa AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03G 320

US Classification:

330136

Abstract:

A gain control amplifier including a plurality of cascaded multipliers with a feed forward gain control circuit attached between the input and a control terminal of the amplifier and providing a logarithmic function of a logarithmic function as the control signal for converting the transfer function of the amplifier to a substantially linear function.