131 patents currently held

16 more in force are now held by other companies

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

3 more records may belong here and await a decision; they are not counted.

The next term ends in Dec 2026. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Dec 2026

Next term end

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 20442045

notable patents fee due within 90 days all others 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: the highest-ranked patents in this portfolio by citations and family size. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.

Notable patents

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

Notable

Method for Storing Radioactive Waste, and System for Implementing the Same US 10,049,777

Cited by 35 later US patents, top 10% 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 Also notable

Container for Storing And/Or Transporting Spent Nuclear Fuel US 10,410,756

Cited by 26 later US patents, top 10% of utility patents granted in 2019 in our data. Protection runs to 2037.

Ends Dec 2037 · High confidence Also notable

Air-Cooled Condenser System US 11,204,201

Cited by 17 later US patents, top 10% of utility patents granted in 2021 in our data. Protection runs to 2039.

Ends Sep 2039 · High confidence

Formerly held, still cited

Notable

Steam Generator for Nuclear Steam Supply System US 10,395,783

Cited by 23 later US patents, top 25% of utility patents granted in 2019 in our data. Protection runs to 2036.

now held by SMR Inventec, LLC

Ends Mar 2036 · 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 Nov 21, 2026
4 fees due Dec 2 to 25, 2026 · next Dec 2
2 fees due Jan 4 to 9, 2027 · next Jan 4
6 fees due Feb 1 to 28, 2027 · next Feb 1
4 fees due Mar 10 to 26, 2027 · next Mar 10
5 fees due Apr 15 to 24, 2027 · next Apr 15
2 fees due May 5 to 12, 2027 · next May 5
3 fees due Jun 8 to 24, 2027 · next Jun 8
4 fees due Jul 14 to 30, 2027 · next Jul 14
1 fee due Aug 23, 2027
The maintenance fee for Neutron Shielding Ring, Apparatus and Method Using the Same for Storing High Level Radioactive Waste (US 9,269,464) comes due Aug 23, 2027. Unpaid by Feb 23, 2028, it lapses early.
1 fee due Sep 22, 2027
The maintenance fee for Ventilated System for Storing High Level Radioactive Waste (US 9,293,229) comes due Sep 22, 2027. Unpaid by Mar 22, 2028, it lapses early.
1 fee due Nov 12, 2027
The maintenance fee for Rack for Underwater Storage of Spent Nuclear Fuel (US 10,650,933) comes due Nov 12, 2027. Unpaid by May 12, 2028, 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
1 term has ended since Aug 16, 2026

What they patent

The 5 largest of its 43 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Nuclear Waste Cask with Impact Protection	13 in force	to Jun 2042
Environmentally Suquestered Spent Fuel Pool	11 in force	to Sep 2038
Ventilated System for Storing High Level Radioactive Waste	11 in force	to Feb 2035
Container for Storing And/Or Transporting Spent Nuclear Fuel	10 in force	to Feb 2040
Earthquake-Resistant Fuel Storage Rack System for Fuel Pools in Nuclear Plants	9 in force	to Nov 2040

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 11,342,091	Systems and Methods for Storing Spent Nuclear Fuel In force Term ends Dec 17, 2026 · High confidence	In force	Term ends Dec 17, 2026	High confidence
US 10,614,924	Manifold System for the Ventilated Storage of High Level Waste and a Method of Using the Same to Store High Level Waste in a Below-Grade Environment In force Term ends Jan 5, 2027 · High confidence	In force	Term ends Jan 5, 2027	High confidence
US 9,443,625	Method of Storing High Level Radioactive Waste In force Term ends May 13, 2027 · High confidence	In force	Term ends May 13, 2027	High confidence
US 8,277,746	Apparatus, System and Method for Facilitating Transfer of High Level Radioactive Waste to And/Or from a Pool In force Term ends Aug 31, 2027 · High confidence	In force	Term ends Aug 31, 2027	High confidence
US 8,135,107	Canister Apparatus and Basket for Transporting, Storing And/Or Supporting Spent Nuclear Fuel In force Term ends Sep 6, 2027 · High confidence	In force	Term ends Sep 6, 2027	High confidence
US 8,929,504	Canister Apparatus and Basket for Transporting, Storing And/Or Supporting Spent Nuclear Fuel In force Term ends Sep 6, 2027 · High confidence	In force	Term ends Sep 6, 2027	High confidence
US 8,139,706	Apparatus and Method for Supporting Fuel Assemblies in an Underwater Environment Having Lateral Access Loading In force Term ends Sep 13, 2027 · High confidence	In force	Term ends Sep 13, 2027	High confidence
US 9,269,464	Neutron Shielding Ring, Apparatus and Method Using the Same for Storing High Level Radioactive Waste In force Term ends Jun 22, 2028 · High confidence	In force	Term ends Jun 22, 2028	High confidence
US 9,761,339	Manifold System for the Ventilated Storage of High Level Waste and a Method of Using the Same to Store High Level Waste in a Below-Grade Environment In force Term ends Jul 12, 2028 · High confidence	In force	Term ends Jul 12, 2028	High confidence
US 8,718,220	Manifold System for the Ventilated Storage of High Level Waste and a Method of Using the Same to Store High Level Waste in a Below-Grade Environment In force Term ends Aug 2, 2028 · High confidence	In force	Term ends Aug 2, 2028	High confidence

10 of 131 patents shown.

Pro members see all 131.

Pro members: see all 131 patents

Also on record, not counted in the 131: 16 patents in force now held by others · 59 patents ended · 23 applications pending · 33 applications abandoned. 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.

Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.

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

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