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1988-10-20
A process for the manufacture of lubricating oils
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1991-04-29
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1989-07-20
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1987-01-01
A refined fish oil concentrate and the production process for same
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1988-01-28
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1988-11-17
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1990-08-30
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1996-10-21
Process for the manufacture of lubricating base oils
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1994-07-01
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1995-05-03
Method for the production of oil
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1988-06-30
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1990-11-14
Underwater oil production
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1994-02-09
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1990-10-03
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1991-10-30
A process for the production of a lubricating oil additive concentrate
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1989-03-16
Process for increasing deasphalted oil production
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1988-01-25
A process for the production of ferrous sulphide
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1989-12-07
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1994-01-21
A process for the production of a lubricating oil additive concentrate.
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1989-09-13
Process for the production of pyrolysis oil
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1991-03-13
Process for determining the polarity of a crude oil
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1988-08-31
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1996-08-21
Process for the preparation of a mineral oil additive
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1994-09-14
Method for the production of oil
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1989-11-29
Production of lubrication oils by hydrocracking