Koopman; Roelof
Patent Applications and Registrations
Patent applications and USPTO patent grants for Koopman; Roelof.The latest application filed is for "process and apparatus perforating tubular plastic foil with a laser beam".
- Koopman; Roelof - Hardenberg NL
| Patent | Date |
|---|---|
| Process and apparatus perforating tubular plastic foil with a laser beam Grant 5,108,669 - van Dijk , et al. April 28, 1 | 1992-04-28 |
| Welding sleeve with connecting means having an upper and lower part Grant 4,855,574 - Lodder , et al. August 8, 1 | 1989-08-08 |
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