Dong Kwan Ma

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Seoul, KR

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Patents Grantslast 30 patents

Information Patent Grant
Gas spring device
- Patent number 6,533,084
- Issue date Mar 18, 2003
- Samhongsa Co., Ltd.
- Dong Kwan Ma
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Tube guide for a column unit
- Patent number 6,474,619
- Issue date Nov 5, 2002
- Samhongsa Co., Ltd.
- Dong Kwan Ma
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information Patent Grant
Spindle for a height regulating device
- Patent number 6,439,662
- Issue date Aug 27, 2002
- Samhongsa Co., Ltd.
- Dong Kwan Ma
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information Patent Grant
Device for controlling the height of a swivel chair
- Patent number 6,371,421
- Issue date Apr 16, 2002
- Samhongsa Co., Ltd.
- Dong Kwan Ma
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...

Patents Applicationslast 30 patents

Information Patent Application
Gas spring device
- Publication number 20020162714
- Publication date Nov 7, 2002
- Dong Kwan Ma
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...