7 patents currently held
12 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.
The next term ends in May 2027. from the record
Of the 12 now held by other companies, 12 name Deltavalve LLC as their current owner. Each row says so.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
1
Ending by 2030
May 2027
Next term end
7
Patent families
When these terms end
Held patents by the year their term ends
notable patents
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.
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends May 2027 · High confidence
Also notable
Ends Nov 2034 · High confidence
Also notable
Ends Mar 2035 · High confidence
Probabilistic Stress Wave Analysis System and Method
US 7,505,852
The most cited patent in this portfolio, cited by 70 later US patents, top 10% of utility patents granted in 2009 in our data. Protection runs to 2027.
Check Valve Apparatus And Methods
US 9,383,031
Granted 2016 and renewed at every maintenance window due so far. Protection runs to 2034.
Neutron Absorber Member Configured for Insertion into a Control Rod Guide Tube of a Spent Fuel Assembly
US 10,580,540
The newest of the three, granted 2020. It anchors the portfolio to 2035, later than anything else here.
Formerly held, still cited
Notable
Ends Apr 2031 · High confidence
The largest patent family in this portfolio, 31 related applications, renewed at 3 of 3 maintenance windows. Protection runs to 2031.
now held by Deltavalve, LLC
Also notable
Ends Nov 2030 · High confidence
Renewed at every maintenance window since the 2013 grant; no more fees are due before its term ends in 2030.
now held by Deltavalve, LLC
Also notable
Ends Mar 2029 · High confidence
Renewed at every maintenance window since the 2011 grant; no more fees are due before its term ends in 2029.
now held by Deltavalve, LLC
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 Sep 3, 2027The maintenance fee for Neutron Absorber Member Configured for Insertion into a Control Rod Guide Tube of a Spent Fuel Assembly (US 10,580,540) comes due Sep 3, 2027. Unpaid by Mar 3, 2028, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 2 largest of its 7 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Relief Valve | 1 in force | to Jun 2043 |
| Neutron Absorber Member Configured for Insertion into a Control Rod Guide Tube of a Spent Fuel Assembly | 1 in force | to Mar 2035 |
Patents held now
Soonest term end first.
Showing 1 to 7 of 7
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,505,852 | Probabilistic Stress Wave Analysis System and Method In force · High confidence | In force | High confidence | |
| US 8,701,693 | Nozzle Check Valve In force · High confidence | In force | High confidence | |
| US 9,383,031 | Check Valve Apparatus And Methods In force · High confidence | In force | High confidence | |
| US 10,580,540 | Neutron Absorber Member Configured for Insertion into a Control Rod Guide Tube of a Spent Fuel Assembly In force · High confidence | In force | High confidence | |
| US 11,521,757 | Inadvertent Actuation Block Valve for a Small Modular Nuclear Reactor In force · High confidence | In force | High confidence | |
| US 12,504,083 | Relief Valve In force · High confidence | In force | High confidence | |
| US 12,131,831 | Sheet Based, In-Bundle Reactivity Control Device for Storage of Spent Nuclear Fuel In force · High confidence | In force | High confidence |
Also on record, not counted in the 7: 12 patents in force now held by others · 36 patents ended · 1 application pending · 6 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.