KENKMAN, DONALD L.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4743545 Hollow porous microspheres containing biocatalystExpiredOct 03, 84May 10, 88[C12P, C12N, G01N, C07K]
4671909 Method for making hollow porous microspheresExpiredAug 09, 84Jun 09, 87[C03B, B29C, C04B]
4637990 Hollow porous microspheres as substrates and containers for catalysts and method of making sameExpiredMar 14, 85Jan 20, 87[B01J]
4582534 Metal microspheres, filamented hollow metal microspheres and articles produced therefromExpiredSep 15, 83Apr 15, 86[B22F]
4568389 Shaped form or formed mass of hollow metal microspheresExpiredSep 15, 83Feb 04, 86[B22F]
4548196 Solar collector comprising transparent hollow plastic microspheres as insulation materialExpiredSep 30, 82Oct 22, 85[F24J]
4536361 Method for producing plastic microfilamentsExpiredNov 16, 82Aug 20, 85[D01D]
4525314 Producing metal and metal glass microfilamentsExpiredNov 08, 82Jun 25, 85[C03B]
4415512 Method and apparatus for producing hollow metal microspheres and microspheroidsExpiredMar 18, 81Nov 15, 83[C03B]
4363646 Method and apparatus for producing microfilamentsExpiredNov 27, 81Dec 14, 82[C03B]
4303061 Solar energy collector having hollow microspheresExpiredDec 13, 79Dec 01, 81[F24J]
4303431 Method and apparatus for producing hollow microspheresExpiredMay 23, 80Dec 01, 81[C03C, C03B]
4303432 Method for compressing gaseous materials in a contained volumeExpiredAug 18, 80Dec 01, 81[C03C, C03B]
4303433 Centrifuge apparatus and method for producing hollow microspheresExpiredAug 18, 80Dec 01, 81[C03C, C03B]
4303603 Method and apparatus for producing hollow plastic microspheresExpiredJun 19, 80Dec 01, 81[B29D]
4303729 Hollow plastic microspheresExpiredDec 12, 79Dec 01, 81[B32B]
4303730 Hollow microspheresExpiredDec 13, 79Dec 01, 81[B32B]
4303731 Compressed gaseous materials in a contained volumeExpiredDec 13, 79Dec 01, 81[C03C, B32B]
4303732 Hollow microspheresExpiredDec 13, 79Dec 01, 81[B32B]
4303736 Hollow plastic microspheresExpiredDec 13, 79Dec 01, 81[B22B, B32B]

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