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Inventor

DONALD HUBBARD H

US8 patents
⚠️ This page may combine multiple inventors who share the name “DONALD HUBBARD H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

(unassigned)

4 patents
US6406619B1Jun 18, 2002

Three stage sewage treatment plant

39 citations91
US6200472B1Mar 13, 2001

Three stage sewage treatment system

40 citations91
US6228258B1May 8, 2001

Sewage treatment system with chlorinator

16 citations82
US6827850B2Dec 7, 2004

Diffusion bar aerobic treatment plant

3 citations61

DONALD HUBBARD H

4 patents
US6982033B2Jan 3, 2006

Aerobic treatment plant with filter pipe

DONALD HUBBARD H8 citations71
USD510757SOct 18, 2005

Trio sewage treatment plant

DONALD HUBBARD H6 citations71
USD539383SMar 27, 2007

Trio sewage treatment plant

DONALD HUBBARD H4 citations60
USD539382SMar 27, 2007

Duo sewage treatment plant

DONALD HUBBARD H3 citations60