Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4681612 | Process for the separation of landfill gas | John V. O'Brien, Richard Hopewell | 1987-07-21 |
| 4462814 | Distillative separations of gas mixtures containing methane, carbon dioxide and other components | James M. Ryan | 1984-07-31 |
| 4383841 | Distillative separation of carbon dioxide from hydrogen sulfide | James M. Ryan | 1983-05-17 |
| 4350511 | Distillative separation of carbon dioxide from light hydrocarbons | James M. Ryan | 1982-09-21 |
| 4318723 | Cryogenic distillative separation of acid gases from methane | James M. Ryan | 1982-03-09 |
| 4293322 | Distillative separation of carbon dioxide from hydrogen sulfide | James M. Ryan | 1981-10-06 |