Birchtech Corp.

9 patents currently held · Updated Nov 14, 2026

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

Previously recorded as Midwest Energy Emissions Corp. (to 2024)

Ending by 2030

Jul 2028

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 13, 2027
The maintenance fee for Mercury Control Using Moderate-Temperature Dissociation of Halogen Compounds (US 9,155,997) comes due Apr 13, 2027. Unpaid by Oct 13, 2027, it lapses early.
1 fee due May 12, 2027
The maintenance fee for Activated Carbon Sorbent Including Nitrogen and Methods of Using the Same (US 10,471,412) comes due May 12, 2027. Unpaid by Nov 12, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 of the patents on this record was granted since Aug 16, 2026
2 terms have ended since Aug 16, 2026

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 9 of 9

Patent	Title	Status	Expires	Confidence
US 9,155,997	Mercury Control Using Moderate-Temperature Dissociation of Halogen Compounds In force Ends no later than Jul 2, 2028 · Medium confidence	In force	Ends no later than Jul 2, 2028	Medium confidence
US 9,675,931	Mercury Control Using Moderate-Temperature Dissociation of Halogen Compounds In force Ends no later than Jul 2, 2028 · Medium confidence	In force	Ends no later than Jul 2, 2028	Medium confidence
US 9,662,629	Carbon nanocomposite sorbent and methods of using the same for separation of one or more materials from a gas stream In force Term ends May 15, 2032 · From the USPTO record	In force	Term ends May 15, 2032	From the USPTO record
US 9,011,805	Carbon Nanocomposite Sorbent and Methods of Using the Same for Separation of One or More Materials from a Gas Stream In force Term ends Mar 30, 2033 · High confidence	In force	Term ends Mar 30, 2033	High confidence
US 10,130,930	Sorbent comprising carbon and nitrogen and methods of using the same In force Term ends Mar 3, 2034 · From the USPTO record	In force	Term ends Mar 3, 2034	From the USPTO record
US 10,471,412	Activated Carbon Sorbent Including Nitrogen and Methods of Using the Same In force Term ends Mar 3, 2034 · High confidence	In force	Term ends Mar 3, 2034	High confidence
US 11,059,028	Activated Carbon Sorbent Including Nitrogen and Methods of Using the Same In force Term ends Mar 3, 2034 · High confidence	In force	Term ends Mar 3, 2034	High confidence
US 9,669,355	Activated Carbon Sorbent Including Nitrogen and Methods of Using the Same In force Term ends Sep 14, 2034 · High confidence	In force	Term ends Sep 14, 2034	High confidence
US 12,758,942	Activated Carbon Composite and Method of Removing Contaminant In force Term ends Nov 7, 2045 · High confidence	In force	Term ends Nov 7, 2045	High confidence

Also on record, not counted in the 9: 2 lapsed for an unpaid fee · 17 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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