Charles David Hansen
Physician in Salt Lake City, UT

5391349, Feb 21, 1995

Nov 12, 1993

8/151210

Charles N. Hansen - Salt Lake City UT

C23F 1100, C23F 1108

422 7

The corrosion of ferrous-based metals imbedded in concrete containing a chloride is inhibited by drawing the chlorides away from the metal, and then applying a composition containing ammonium carbamate or ammonium carbonate to the concrete. An agent may be added to the solution to prevent any calcium hydroxide contained in the concrete from precipitating the corrosion inhibitor.

4148938, Apr 10, 1979

Mar 31, 1977

5/783113

Charles N. Hansen - Salt Lake City UT

B05C 116, C09K 318

427136

Compositions of carboxy methyl cellulose and method for treating cured concrete and bituminous concrete, the surfaces of which are subject to the accumulation of water, melting ice and snow, to reduce spalling or degradation of such surfaces when subjected to the freezing and thawing action of the water and water based solutions which are absorbed into the same. A protecting agent is used to maintain the carboxy methyl cellulose in a soluble state when applied to concrete surfaces.

5275752, Jan 4, 1994

May 18, 1992

7/884170

Charles N. Hansen - Salt Lake City UT

C09K 318

252 70

The corrosive effect of salt on reinforced concrete in roadways, overpasses, bridges and buildings is inhibited by the application of a composition which consists essentially of ammonium carbamate, or which consists essentially of ammonium carbamate combined with salt or calcium chloride, as a deicer.

4094805, Jun 13, 1978

Sep 23, 1976

5/711575

Charles Nyberg Hansen - Salt Lake City UT

C09K 318

252 70

Methods and compositions for preventing or reducing spalling or degradation of pavement materials, including portland cement concrete and bituminous concrete, when a pavement is subjected to a freezing and thawing action while in contact with water or with de-icing solutions which have been produced by the action of de-icing compounds.

5316554, May 31, 1994

Jul 28, 1993

8/102991

Charles N. Hansen - Salt Lake City UT

B01D 900, C01B 300, C07C27300

23300

Ammonium carbamate, in solution with urea, water and ammonia and under high temperature and pressure is cooled to below its crystallization temperature while being subjected to an elevated pressure. The crystallized substance formed is then dried, crushed, and pelletized with the aid of a binding agent to produce pellets having substantial strength and stability, and having particular utility as a deicer for roadways.

4698173, Oct 6, 1987

Nov 24, 1986

6/933860

Charles N. Hansen - Salt Lake City UT

C09K 318

252 70

A deicing material which is not corrosive to reinforcing steel or aluminum in overpasses and bridges consists essentially of ammonium carbamate and may be combined with urea production by-products or certain alkalis.

5383962, Jan 24, 1995

Oct 19, 1993

8/137931

Charles N. Hansen - Salt Lake City UT

C09K 318

106 1421

Compositions of ammonium carbonate and ammonium bicarbonate that are suitable to apply to ferrous materials to inhibit corrosion by chlorides are disclosed.