Wittjen; Kristian Bernhard
Patent Applications and Registrations
Patent applications and USPTO patent grants for Wittjen; Kristian Bernhard.The latest application filed is for "method for performing an elevator rescue run".
- Wittjen; Kristian Bernhard - Teltow DE
- Wittjen; Kristian Bernhard - Berlin DE
| Patent | Date |
|---|---|
| Method for performing an elevator rescue run Grant 7,681,693 - Tegtmeier , et al. March 23, 2 | 2010-03-23 |
| Electrical elevator rescue system Grant 7,549,515 - Tegtmeier , et al. June 23, 2 | 2009-06-23 |
| Method For Performing an Elevator Rescue Run App 20080202859 - Tegtmeier; Dirk Heinrich ; et al. | 2008-08-28 |
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