Callahan; Richard A.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Callahan; Richard A..The latest application filed is for "membrane technology to reduce nitrogen in natural gas".
- Callahan; Richard A. - Isle La Motte VT
- Callahan; Richard A. - Burlington VT
- Callahan; Richard A. - Waitsfield VT
- Callahan; Richard A. - S. Pasadena CA
| Patent | Date |
|---|---|
| Membrane technology to reduce nitrogen in natural gas Grant 6,953,492 - Callahan October 11, 2 | 2005-10-11 |
| Membrane technology to reduce nitrogen in natural gas App 20040035291 - Callahan, Richard A. | 2004-02-26 |
| Membrane technology to remove non-condensable gases from refrigeration systems Grant 6,128,916 - Callahan , et al. October 10, 2 | 2000-10-10 |
| Multiple stage semi-permeable membrane process and apparatus for gas separation Grant 5,482,539 - Callahan January 9, 1 | 1996-01-09 |
| Process and apparatus for producing liquid carbon dioxide Grant 5,233,837 - Callahan August 10, 1 | 1993-08-10 |
| Vesicle formulation for the controlled release of therapeutic agents Grant 5,186,941 - Callahan , et al. February 16, 1 | 1993-02-16 |
| Method or systems of determining physiological status Grant 4,724,845 - Callahan February 16, 1 | 1988-02-16 |
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