Six patents currently held, every record listed here

1 more in force is now held by another company

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

The next term ends in Apr 2033. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Apr 2033

Next term end

Patent families

When these terms end

Each bar runs from grant to computed term end. 2016 to 2035.

US 9,567,219 Method and Systems for Forming Carbon Nanotubes Dec 12, 2032

US 9,505,620 Carbonaceous Feedstocks for Forming Carbon Allotropes Apr 10, 2033

US 9,504,998 Generating Catalysts for Forming Carbon Allotropes Apr 10, 2033

US 9,663,367 Reactor System for the Production of Carbon Allotropes Sep 13, 2033

US 10,343,104 Removing Carbon Nanotubes from a Continuous Reactor Effluent no later than Aug 11, 2034

US 9,975,793 Removing Carbon Nanotubes from a Water System Feb 5, 2035

US 10,351,974 Feedstocks for Forming Carbon Allotropes Oct 9, 2035

20202024202820322035

A dotted end marks a recorded terminal disclaimer this site has not resolved: the term can only be shorter than the bar, never longer.

Every computed term in this portfolio is shown above.Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

Notable patents

Ranked by citations and family size, against patents of the same kind granted the same year. How we rank

Notable

Removing Carbon Nanotubes from a Continuous Reactor Effluent US 10,343,104

The most cited patent in this portfolio, cited by 43 later US patents, top 5% of utility patents granted in 2019 in our data. Protection runs to 2034. A terminal disclaimer is on file and its reference is not resolved, so no cap is applied and the date may move earlier, never later.

Ends no later than Aug 2034 · Medium confidence Also notable

Feedstocks for Forming Carbon Allotropes US 10,351,974

Cited by 24 later US patents, top 10% of utility patents granted in 2019 in our data. Protection runs to 2035.

Ends Oct 2035 · High confidence Also notable

Removing Carbon Nanotubes from a Water System US 9,975,793

Cited by 17 later US patents, top 25% of utility patents granted in 2018 in our data, and renewed at every maintenance window due so far. Protection runs to 2035.

Ends Feb 2035 · High confidence

Formerly held, still cited

Notable

Method and Systems for Forming Carbon Nanotubes US 9,567,219

Cited by 31 later US patents, top 25% of utility patents granted in 2017 in our data, and renewed at every maintenance window due so far. Protection runs to 2032.

now held by ExxonMobil Upstream Research Company

Ends Dec 2032 · High confidence

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.

2 fees due Jan 9 to 16, 2027 · next Jan 9

Which patents, and when each one lapses · Pro

Recent changes

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

What they patent

The 5 largest of its 6 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Feedstocks for Forming Carbon Allotropes	1 in force	to Oct 2035
Removing Carbon Nanotubes from a Water System	1 in force	to Feb 2035
Removing Carbon Nanotubes from a Continuous Reactor Effluent	1 in force	to Aug 2034
Reactor System for the Production of Carbon Allotropes	1 in force	to Sep 2033
Carbonaceous Feedstocks for Forming Carbon Allotropes	1 in force	to Apr 2033

Patents held now

Soonest term end first.

Showing 1 to 6 of 6

Patent	Title	Status	Expires	Confidence
US 9,504,998	Generating Catalysts for Forming Carbon Allotropes held by ExxonMobil Upstream Research Company In force Term ends Apr 10, 2033 · High confidence	In force	Term ends Apr 10, 2033	High confidence
US 9,505,620	Carbonaceous Feedstocks for Forming Carbon Allotropes held by ExxonMobil Upstream Research Company In force Term ends Apr 10, 2033 · High confidence	In force	Term ends Apr 10, 2033	High confidence
US 9,663,367	Reactor System for the Production of Carbon Allotropes held by ExxonMobil Upstream Research Company In force Term ends Sep 13, 2033 · High confidence	In force	Term ends Sep 13, 2033	High confidence
US 10,343,104	Removing Carbon Nanotubes from a Continuous Reactor Effluent held by ExxonMobil Upstream Research Company In force Ends no later than Aug 11, 2034 · Medium confidence	In force	Ends no later than Aug 11, 2034	Medium confidence
US 9,975,793	Removing Carbon Nanotubes from a Water System held by ExxonMobil Upstream Research Company In force Term ends Feb 5, 2035 · High confidence	In force	Term ends Feb 5, 2035	High confidence
US 10,351,974	Feedstocks for Forming Carbon Allotropes held by ExxonMobil Upstream Research Company In force Term ends Oct 9, 2035 · High confidence	In force	Term ends Oct 9, 2035	High confidence

Also on record, not counted in the 6: 1 patent in force now held by others. List them

Sources and methods

Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built

Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.

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

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