Richard T Gardner

US Patent:

46844546, Aug 4, 1987

Filed:

May 8, 1986

Appl. No.:

6/861081

Inventors:

Richard N. Gardner - Stillwater MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C23C 1442

US Classification:

2041922

Abstract:

A triode vacuum sputtering process, and vacuums in the range of 4. times. 10. sup. -3 to 6. times. 10. sup. -4 Torr are used to obtain amorphous rate earth/transition metal alloy thin films useful as magneto optic media. By adjusting process parameters such as substrate temperature, anode bias and deposition rate, the properties of the thin film can be altered.

US Patent:

44915586, Jan 1, 1985

Filed:

Nov 5, 1981

Appl. No.:

6/318430

Inventors:

Richard N. Gardner - Stillwater MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B22F 326
B22F 700

US Classification:

419 23

Abstract:

A precision molded article, such as a die cavity, is made by combining iron powder granules and optional manganese granules with a heat fugutive organic binder, molding the granule-binder mixture into a green molded preform, thermally degrading and removing essentially all the binder to form a skeletal preform, and infiltrating the preform with an infiltrant which has a lower melting point than the iron powder granules and which optionally contains manganese, with the proviso that either the above decribed manganese granules are employed or manganese-containing infiltrant is employed, thereby forming a molded article having a skeleton of ferroalloy granules having a martensitic or perlitic core and an outer layer of austenitic manganese steel, the skeleton being surrounded by infiltrant.

US Patent:

43271561, Apr 27, 1982

Filed:

May 12, 1980

Appl. No.:

6/148809

Inventors:

Kenneth R. Dillon - White Bear Lake MN
Richard N. Gardner - Stillwater MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B22F 300
C22C 105

US Classification:

428568

Abstract:

A precision molded article, such as a die cavity, is made by combining granules of a refractory and granules of a first metal or alloy which has a homogeneous crystalline appearance at a temperature below its melting point and has a lower Rockwell Hardness than the refractory, mixing the granules with a heat fugitive organic binder, molding the granule-binder mixture into a green molded preform, thermally degrading and removing essentially all the binder to form a skeletal preform, and infiltrating the preform with a second metal or alloy which will wet the first metal or alloy and has a lower Rockwell Hardness than the first metal or alloy, thereby forming a molded article having refractory granules fully enveloped within a single skeleton of the first metal or alloy, the refractory granules and skeleton of first metal being surrounded by layers or matrices of softer metals.