Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4833167 | 2-aza-substituted 1-carbadethiapen-2-em-3-carboxylic acids | Burton G. Christensen, John C. Chabala | 1989-05-23 |
| 4820817 | Process for preparing 3-substituted-6-substituted-7-oxo-1-azabicycl(3.2.0)-hept-2-ene-2-carbox ylic acid | Burton G. Christensen | 1989-04-11 |