Ma; Dong Kwan
Patent Applications and Registrations
Patent applications and USPTO patent grants for Ma; Dong Kwan.The latest application filed is for "column unit".
- Ma; Dong Kwan - Anyang-si Gyeonggi-do KR
- Ma, Dong Kwan - Gyeonggi-do KR
- Ma, Dong Kwan - Kyonggi-Do KR
- Ma; Dong Kwan - Seoul KR
| Patent | Date |
|---|---|
| Gas cylinder Grant 7,134,379 - Jeon , et al. November 14, 2 | 2006-11-14 |
| Column unit App 20040079854 - Ma, Dong Kwan ; et al. | 2004-04-29 |
| Gas cylinder App 20040061367 - Jeon, Young Sang ; et al. | 2004-04-01 |
| Gas spring device App 20020162714 - Ma, Dong Kwan | 2002-11-07 |
| Device for controlling the height of a swivel chair Grant 6,371,421 - Ma , et al. April 16, 2 | 2002-04-16 |
| Spindle for a height regulating device App 20010052720 - Ma, Dong Kwan | 2001-12-20 |
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