PatentBrief

Year in Patents

Patents Granted in 1991

Landmark US patents granted in 1991 — explained in plain English. The inventions, the assignees, and what each one actually protects.

Granted in 1991

3 patents
biotech

US 5075216 · 1991 · Cetus Corp

Using Heat-Resistant Enzymes to Read DNA Sequences Faster

US 5013088 · 1991 · Data Tech Services Inc

How Tamper-Proof Labels That Break Into Pieces Work

pharmaceutical

US 5002952 · 1991 · Green Cross Corp Japan

How to Make Hard-to-Absorb Medicines Easier for the Body to Use

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