Michael R Ludwig

US Patent:

20060162263, Jul 27, 2006

Filed:

Dec 20, 2005

Appl. No.:

11/314947

Inventors:

Michael Ludwig - Thornton CO, US

International Classification:

E04B 1/32

US Classification:

052080100

Abstract:

A grate for an opening that has a wall section with an upper rim, such as a window well, includes a rigid base and a plurality of rigid spokes extending outwardly from the base. Each spoke includes a fixed section affixed to the base and an extendible section that terminates in a distal end and that is movably supported by the fixed section between a retracted position and an extended position. The sections of the spokes may be telescopically engaged. In one embodiment, the base includes a hub member and a brace member positioned outwardly of the hub member with the fixed member of the spokes having opposite ends affixed respectively thereto. In another embodiment, the base member has a central section and a pair of base extension pieces that may be extended and retracted.

US Patent:

59044470, May 18, 1999

Filed:

Jul 2, 1997

Appl. No.:

8/887151

Inventors:

Julie K. Sutton - Denver CO
Michael R. Ludwig - Denver CO
Stan Rupiper - Tahoma CA

Assignee:

Integrated Stabilization Technologies Inc. - Denver CO

International Classification:

E02D5/18

US Classification:

405263

Abstract:

A drive device for injecting different types of fluids, chemicals and slurries into a subsurface for soil stabilization and removing fluids from the subsurface prior to treating a soil. The device is designed to be self advancing into the soil. When the driving of the device in the ground surface is completed, the device can be removed or it can be left in place for forming an anchor or load carrying pier. The device includes a plurality of external and internal hollow pipe sections. The pipe sections are joined together with couplings. Each coupling includes perforations therein and helices around the exterior surface of the coupling. The helices are used for driving the pipe sections into the ground. The perforations in each coupling are used for introducing fluids under pressure into the soil or for extracting fluids from the subsurface. The fluids are pumped under pressure between the inner circumference of the external pipe section and the outer circumference of the internal pipe section and out the perforations in the coupling.