Stephens; Robert Douglas
Patent Applications and Registrations
Patent applications and USPTO patent grants for Stephens; Robert Douglas.The latest application filed is for "railway hazard acoustic sensing, locating, and alarm system".
- Stephens; Robert Douglas - Port Coquitlam British Columbia CA
| Patent | Date |
|---|---|
| Railway hazard acoustic sensing, locating, and alarm system Grant 6,216,985 - Stephens April 17, 2 | 2001-04-17 |
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