Hung-jen Tien

7 Patents

• US122919162025

  Easy-to-install Door Opener

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US118519352023

  Door Opener Capable of Controlling Door Closing Speed

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US118348892023

  Door Opener with Adjustable Screw Rod

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US118280972023

  Door Opener Having an Anti-loose Linking Unit

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US117957512023

  Driving Device for a Door Opener

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US117538482023

  Door Lock with Reinforced Fireproof Function

  I-TEK METAL MFG. CO., Ltd

  0 cites
• US116295442023

  Door Opener with Exposed Control Panel

  I-TEK METAL MFG. CO., Ltd

  0 cites