Purafil, 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.

Ending by 2030

Nov 2027

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

Fee deadlines

No maintenance fee falls due on this company's record before Nov 15, 2027.

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 8,586,502	Dry Scrubbing Media Compositions and Methods of Production and Use In force Ends no later than Nov 30, 2027 · Medium confidence	In force	Ends no later than Nov 30, 2027	Medium confidence
US 8,247,346	Dry Scrubbing Air Filtration Media In force Term ends Mar 18, 2030 · High confidence	In force	Term ends Mar 18, 2030	High confidence
US 8,420,038	Method for Removing Contaminants from a Fluid Stream In force Term ends Mar 18, 2030 · High confidence	In force	Term ends Mar 18, 2030	High confidence
US 8,182,775	Dry-Scrubbing Media Compositions and Methods of Production and Use In force Term ends Oct 29, 2030 · High confidence	In force	Term ends Oct 29, 2030	High confidence
US 8,992,867	Dry-Scrubbing Media Compositions and Methods of Production and Use In force Term ends Dec 5, 2030 · High confidence	In force	Term ends Dec 5, 2030	High confidence
US 8,343,401	Filtration Media Having Recycled Waste Materials In force Term ends Apr 25, 2031 · High confidence	In force	Term ends Apr 25, 2031	High confidence
US 10,857,518	Dry-Scrubbing Media Compositions and Methods of Production and Use In force Term ends Sep 15, 2031 · High confidence	In force	Term ends Sep 15, 2031	High confidence
US 10,151,683	Corrosion sensor using electrical continuity In force Term ends Jul 3, 2036 · High confidence	In force	Term ends Jul 3, 2036	High confidence
US 11,040,307	Method for Removing Contaminant from a Fluid Stream In force Term ends Jan 24, 2037 · High confidence	In force	Term ends Jan 24, 2037	High confidence
US 12,357,935	Filter Module with Radio-Frequency Identification Tag for Tuning a Filtration System In force Term ends Nov 3, 2042 · High confidence	In force	Term ends Nov 3, 2042	High confidence

10 of 12 patents shown.

Pro members see all 12.

Pro members: see all 12 patents

Also on record, not counted in the 12: 2 lapsed for an unpaid fee · 8 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.

Export every term end as CSV · Pro

Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

5 abandoned

List them