1
Melvin A Leitheiser, Harold G Sowman: Non-fused aluminum oxide-based abrasive mineral. Minnesota Mining and Manufacturing Company, Cruzan Alexander, Donald M Sell, Richard Francis, February 9, 1982: US04314827 (401 worldwide citation)

The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of .alpha.-alumina and a secondary phase, to a method of making the same employing chemical ceramic techno ...


2
Thomas E Wood, David M Wilson, Harold G Sowman: Microcrystalline alumina-based ceramic articles. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Lorraine R Sherman, February 9, 1993: US05185299 (162 worldwide citation)

Microcrystalline alpha-alumina based ceramic articles comprising at least 60% alumina by weight, and 0.1-7.0 percent by weight iron equivalence in which substantially all the alumina is in the alpha phase having a uniform grain structure comprising alpha alumina crystallites with an average crystall ...


3
Harold G Sowman: Non-vitreous ceramic metal oxide microcapsules and process for making same. Minnesota Mining and Manufacturing Company, Cruzan Alexander, Donald M Sell, William G Ewert, September 14, 1982: US04349456 (150 worldwide citation)

Shaped and fired, porous or impermeable nonvitreous ceramic microcapsules of metal oxide, preferably transparent and polycrystalline, are made by a non-melt process comprising the liquid-liquid extraction of aqueous metal oxide precursor with a dehydrating liquid having a limited water solubility, a ...


4
Melvin A Leitheiser, Harold G Sowman: Articles containing non-fused aluminum oxide-based abrasive mineral. Minnesota Mining and Manufacturing Company, Donald M Sell, James A Smith, Richard Francis, May 21, 1985: US04518397 (129 worldwide citation)

The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of .alpha.-alumina and a secondary phase, to a method of making the same employing chemical ceramic techno ...


5
Roger W Lange, Harold G Sowman: Shaped and fired articles of TiO.sub.2. Minnesota Mining and Manufacturing Company, Cruzan Alexander, Donald M Sell, William G Ewert, August 28, 1979: US04166147 (104 worldwide citation)

Solid, shaped and fired refractory articles, such as fibers and microspheres, of titanium dioxide are made by shaping, gelling, and firing titania sols. Said fibers can be made by extruding in air a viscous aqueous titania sol, and heating and firing the resulting green fiber to remove water, decomp ...


6
Karl A Karst, Harold G Sowman: Non-frangible alumina-silica fibers. Minnesota Mining and Manufacturing Company, Cruzan Alexander, Donald M Sell, William G Ewert, September 13, 1977: US04047965 (94 worldwide citation)

Transparent, smooth, fracture resistant, discreet, refractory oxide fibers of homogeneous chemical composition comprising 96 to 100 weight percent of a mixture or chemical combination of 67 to 77 parts by weight alumina and 23 to 33 parts by weight silica, said fibers having a predominant polycrysta ...


7
Kyung H Moh, Harold G Sowman, Thomas E Wood: Sol gel-derived ceramic bubbles. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Lorraine R Sherman, December 31, 1991: US05077241 (80 worldwide citation)

Discrete, free-flowing, ceramic microbubbles consist essentially of at least one of a non-oxide component and an oxide component having diameters in the range of 1 to 300 micrometers and each having a wall thickness of less than 10 percent of the diameter of the bubble. In the process of the inventi ...


8
David R Kaar, Harold G Sowman: Microcrystalline transition metal oxide spinel articles. Minnesota Mining and Manufacturing Company, Donald M Sell, James A Smith, Lorraine R Sherman, July 12, 1988: US04757036 (77 worldwide citation)

Homogeneous, nonporous ceramic fibers containing at least one magnetically-unaligned, microcrystaline transition metal oxide spinel phase. The ceramic fibers may be used in polymeric, ceramic and metallic composites. Said ceramic spinel is produced by dispersing soluble inorganic and transition meta ...


9
Harold G Sowman: Internally modified ceramic fiber. Minnesota Mining and Manufacturing Company, Donald M Sell, Lorraine R Sherman, January 10, 1989: US04797378 (65 worldwide citation)

A multicomponent ceramic article which can be a fiber or particle comprises a continuous ceramic matrix phase and at least one in situ-generated discontinuous ceramic or metal phase. Particles can include shapes in the form of beads, flakes, granules, and microspheres.


10
Roger W Lange, Harold G Sowman, Soon Kun Kang: Silica coating. Minnesota Mining and Manufacturing Company, D M Sell, C Truesdale, March 28, 1989: US04816333 (62 worldwide citation)

A coated article having a substrate coated with a layer of silica particles is provided. The coating is substantially uniform in thickness, adheres aggressively to the substrate, and provides excellent antireflection properties to the substrate.