John Martin Halliwell

3 Patents

• US117427942023

  Frame with Plenum for Supporting a Photovoltaic Array

  HC Properties Inc

  0 cites
• US116138642023

  Secant Concrete Shoring Using Helical Piles for Depth

  HC Properties Inc.

  0 cites
• US116142592023

  Ground Heat Exchanger

  HC Properties Inc.

  0 cites