Warthmann; Robert
Patent Applications and Registrations
Patent applications and USPTO patent grants for Warthmann; Robert.The latest application filed is for "sliding closures for roadway expansion joints".
- Warthmann; Robert - CH-8604 Volketswil CH
- Warthmann; Robert - Volketswil CH
| Patent | Date |
|---|---|
| Sliding closures for roadway expansion joints Grant 5,051,024 - Warthmann September 24, 1 | 1991-09-24 |
| Method and apparatus for butt welding of plastic pipes of large diameter Grant 4,401,497 - Warthmann August 30, 1 | 1983-08-30 |
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