Permea, Inc.
20Patents
0Active
20Granted
34Portfolio score
Filing activity: Aug 15, 1986 → Mar 31, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5306331A | Process for cooling the feed gas to gas separation systems | Performing Operations; Transporting | 82 | Expired |
| US5641337A | Process for the dehydration of a gas | Performing Operations; Transporting | 80 | Expired |
| US5779897A | Hollow fiber membrane device with inert filaments randomly distributed in the inter-fiber voids | Emerging Cross-Sectional Technologies | 74 | Expired |
| US5565149A | Control of dissolved gases in liquids | Emerging Cross-Sectional Technologies | 72 | Expired |
| US4880441A | Asymmetric gas separation membranes having graded density skins | Emerging Cross-Sectional Technologies | 55 | Expired |
| US6138995A | Dispense of beverage containing controlled levels of dissolved gas | Emerging Cross-Sectional Technologies | 52 | Expired |
| US4894068A | Process for capturing nitrogen from air using gas separation membranes | Chemistry; Metallurgy | 49 | Expired |
| US5259869A | Use of membrane separation to dry gas streams containing water vapor | Performing Operations; Transporting | 46 | Expired |
| US5282969A | High pressure feed membrane separation process | Performing Operations; Transporting | 42 | Expired |
| US5215554A | Membranes having enhanced selectivity and method of producing such membranes | Performing Operations; Transporting | 32 | Expired |
| US5131929A | Pressure control for improved gas dehydration in systems which employ membrane dryers in intermittent service | Performing Operations; Transporting | 26 | Expired |
| US4871494A | Process for forming asymmetric gas separation membranes having graded density skins | Performing Operations; Transporting | 22 | Expired |
| US5030251A | System and method for separating a portion of a gas from a mixture of gases | Performing Operations; Transporting | 20 | Expired |
| US4728346A | Permeation modified asymmetric gas separation membranes having graded density skins | Performing Operations; Transporting | 20 | Expired |
| US5306427A | Low pressure feed membrane separation process | Performing Operations; Transporting | 13 | Expired |
| US4992221A | Asymmetric gas separation membranes having improved strength | Performing Operations; Transporting | 13 | Expired |
| US5207906A | Membrane separation module | Performing Operations; Transporting | 10 | Expired |
| US5252219A | Compressed permeate sweep membrane separation process | Performing Operations; Transporting | 8 | Expired |
| US5655570A | Condensate drain device | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US5013767A | Asymmetric gas separation membranes having improved strength | Performing Operations; Transporting | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.