Exentec U.S., Inc.

12 patents currently held · Updated Nov 15, 2026

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

Previously recorded as Airgard, Inc. (to 2025)

Ending by 2030

Aug 2027

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 Mar 22, 2027
The maintenance fee for Systems and Methods to Prevent Back-Flash in an Abatement System (US 9,138,679) comes due Mar 22, 2027. Unpaid by Sep 22, 2027, it lapses early.
1 fee due Jun 12, 2027
The maintenance fee for On-demand in-line-blending and supply of chemicals (US 11,839,860) comes due Jun 12, 2027. Unpaid by Dec 13, 2027, it lapses early.
1 fee due Nov 7, 2027
The maintenance fee for Concentrically heated inlet tube for gas scrubbing apparatus (US 11,976,890) comes due Nov 7, 2027. Unpaid by May 8, 2028, 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.

Patent	Title	Status	Expires	Confidence
US 7,794,678	Effluent Gas Scrubbing In force Term ends Aug 8, 2027 · High confidence	In force	Term ends Aug 8, 2027	High confidence
US 7,611,684	Effluent Gas Scrubber and Method of Scrubbing Effluent Gasses In force Term ends Dec 18, 2027 · High confidence	In force	Term ends Dec 18, 2027	High confidence
US 7,771,514	Apparatus and Method for Providing Heated Effluent Gases to a Scrubber In force (reinstated) Term ends Jan 28, 2029 · High confidence	In force (reinstated)	Term ends Jan 28, 2029	High confidence
US 7,854,792	Reactive Gas Control In force Term ends May 8, 2029 · High confidence	In force	Term ends May 8, 2029	High confidence
US 8,496,741	Reactive Gas Control In force Term ends Dec 9, 2029 · High confidence	In force	Term ends Dec 9, 2029	High confidence
US 9,023,303	Extended or Multiple Reaction Zones in Scrubbing Apparatus In force Term ends Mar 14, 2034 · High confidence	In force	Term ends Mar 14, 2034	High confidence
US 9,138,679	Systems and Methods to Prevent Back-Flash in an Abatement System In force Term ends Mar 14, 2034 · High confidence	In force	Term ends Mar 14, 2034	High confidence
US 10,864,526	Electrode for Electrostatic Precipitator Gas Scrubbing Apparatus In force Term ends Apr 13, 2039 · High confidence	In force	Term ends Apr 13, 2039	High confidence
US 11,318,431	On-demand in-line-blending and supply of chemicals In force Term ends Nov 26, 2040 · From the USPTO record	In force	Term ends Nov 26, 2040	From the USPTO record
US 11,839,860	On-demand in-line-blending and supply of chemicals In force Ends no later than Nov 26, 2040 · From the USPTO record	In force	Ends no later than Nov 26, 2040	From the USPTO record

10 of 12 patents shown.

Pro members see all 12.

Pro members: see all 12 patents

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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