Fries; Jeff
Patent Applications and Registrations
Patent applications and USPTO patent grants for Fries; Jeff.The latest application filed is for "method and system for calculating railroad track ballast resistance".
- Fries; Jeff - Kansas City MO
- Fries; Jeff - US
| Patent | Date |
|---|---|
| Method and system for calculating railroad track ballast resistance Grant 7,295,017 - Fries November 13, 2 | 2007-11-13 |
| Digital train system for automatically detecting trains approaching a crossing Grant 7,254,467 - Fries , et al. August 7, 2 | 2007-08-07 |
| Method and system for calculating railroad track ballast resistance App 20070074581 - Fries; Jeff | 2007-04-05 |
| Digital train system for automatically detecting trains approaching a crossing App 20040181321 - Fries, Jeff ; et al. | 2004-09-16 |
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