Westech Engineering, Inc.

10 patents currently held · Updated Nov 14, 2026

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

Recorded under 2 name spellings.

Ending by 2030

Dec 2026

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

1 fee due Apr 10, 2027
The maintenance fee for Modular underdrain systems (US 11,780,741) comes due Apr 10, 2027. Unpaid by Oct 12, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

Nothing was recorded against this company's patents in the last 90 days.

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Showing 1 to 10 of 10

Patent	Title	Status	Expires	Confidence
US 7,670,486	Phosphorus Removal System and Process In force Term ends Dec 15, 2026 · High confidence	In force	Term ends Dec 15, 2026	High confidence
US 8,182,701	Method of optimizing feed distribution in a sedimentation vessel In force Term ends May 6, 2030 · From the USPTO record	In force	Term ends May 6, 2030	From the USPTO record
US 8,123,955	Method of optimizing feed concentration in a sedimentation vessel In force Term ends May 10, 2030 · From the USPTO record	In force	Term ends May 10, 2030	From the USPTO record
US 9,499,423	Electrobiochemical reactor and related method to enhance microbial/enzyme function in transforming or removing contaminants from a liquid In force Term ends May 9, 2031 · From the USPTO record	In force	Term ends May 9, 2031	From the USPTO record
US 9,506,850	Apparatus and method for determining one or more characteristics of a viscous material In force Term ends Dec 28, 2034 · From the USPTO record	In force	Term ends Dec 28, 2034	From the USPTO record
US 11,247,918	Multi-Media Clarification Systems and Methods In force Term ends Dec 8, 2037 · High confidence	In force	Term ends Dec 8, 2037	High confidence
US 10,913,667	Multi-Media Clarification Systems and Methods In force Term ends Jan 17, 2039 · High confidence	In force	Term ends Jan 17, 2039	High confidence
US 11,780,741	Modular underdrain systems In force Ends no later than Mar 15, 2039 · From the USPTO record	In force	Ends no later than Mar 15, 2039	From the USPTO record
US 10,941,050	Modular underdrain systems In force Term ends May 16, 2039 · From the USPTO record	In force	Term ends May 16, 2039	From the USPTO record
US 11,130,693	Combination biological contactor and self-backwashing filter systems In force Term ends Jan 30, 2040 · From the USPTO record	In force	Term ends Jan 30, 2040	From the USPTO record

Also on record, not counted in the 10: 7 lapsed for an unpaid fee · 19 ended at full term. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

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Published applications

Every application published under this name has become a patent.