Eight patents currently held, every record listed here

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. 2014 to 2044.

US 8,899,326 Oil Recovery Process Apr 20, 2033

US 9,897,309 Forced Circulation Steam Generator Apr 20, 2033

US 11,662,120 Reduced Size Fire Tube Boiler System and Method of Operating Same Jun 18, 2035

US 10,690,344 Boiler System and Method of Operating Same May 4, 2037

US 11,933,491 Burner with Adjustable End Cap and Method of Operating Same Dec 30, 2039

US 11,859,811 Auxiliary Boiler Systems and Methods of Operating and Implementing Same Mar 7, 2042

US 12,644,594 Boiler Tube Insert and Boiler Tubes Having Inserts Mar 15, 2044

US 12,455,098 Thermal Efficiency System and Method for Boiler Plant May 6, 2044

20202026203220382044

1 pending application: term is not computable until grant.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

Oil Recovery Process US 8,899,326

The most cited patent in this portfolio, cited by 19 later US patents, top 25% of utility patents granted in 2014 in our data. Protection runs to 2033.

Ends Apr 2033 · High confidence Also notable

Reduced Size Fire Tube Boiler System and Method of Operating Same US 11,662,120

Granted 2023. Computed term ends 2035.

Ends Jun 2035 · High confidence Also notable

Boiler System and Method of Operating Same US 10,690,344

Granted 2020. Computed term ends 2037.

Ends May 2037 · 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.

1 fee due Nov 30, 2026
The maintenance fee for Reduced Size Fire Tube Boiler System and Method of Operating Same (US 11,662,120) comes due Nov 30, 2026. Unpaid by Jun 1, 2027, it lapses early.
1 fee due Jul 2, 2027
The maintenance fee for Auxiliary Boiler Systems and Methods of Operating and Implementing Same (US 11,859,811) comes due Jul 2, 2027. Unpaid by Jan 3, 2028, it lapses early.
1 fee due Sep 19, 2027
The maintenance fee for Burner with Adjustable End Cap and Method of Operating Same (US 11,933,491) comes due Sep 19, 2027. Unpaid by Mar 20, 2028, it lapses early.

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 7 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Oil Recovery Process	2 in force	to Apr 2033
Thermal Efficiency System and Method for Boiler Plant	1 in force	to May 2044
Boiler Tube Insert and Boiler Tubes Having Inserts	1 in force	to Mar 2044
Auxiliary Boiler Systems and Methods of Operating and Implementing Same	1 in force	to Mar 2042
Burner with Adjustable End Cap and Method of Operating Same	1 in force	to Dec 2039

Patents held now

Soonest term end first.

Showing 1 to 8 of 8

Patent	Title	Status	Expires	Confidence
US 8,899,326	Oil Recovery Process In force Term ends Apr 20, 2033 · High confidence	In force	Term ends Apr 20, 2033	High confidence
US 9,897,309	Forced Circulation Steam Generator In force Term ends Apr 20, 2033 · High confidence	In force	Term ends Apr 20, 2033	High confidence
US 11,662,120	Reduced Size Fire Tube Boiler System and Method of Operating Same In force Term ends Jun 18, 2035 · High confidence	In force	Term ends Jun 18, 2035	High confidence
US 10,690,344	Boiler System and Method of Operating Same In force Term ends May 4, 2037 · High confidence	In force	Term ends May 4, 2037	High confidence
US 11,933,491	Burner with Adjustable End Cap and Method of Operating Same In force Term ends Dec 30, 2039 · High confidence	In force	Term ends Dec 30, 2039	High confidence
US 11,859,811	Auxiliary Boiler Systems and Methods of Operating and Implementing Same In force Term ends Mar 7, 2042 · High confidence	In force	Term ends Mar 7, 2042	High confidence
US 12,644,594	Boiler Tube Insert and Boiler Tubes Having Inserts In force Term ends Mar 15, 2044 · High confidence	In force	Term ends Mar 15, 2044	High confidence
US 12,455,098	Thermal Efficiency System and Method for Boiler Plant In force Term ends May 6, 2044 · High confidence	In force	Term ends May 6, 2044	High confidence

Also on record, not counted in the 8: 6 patents ended · 1 application pending · 4 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.

Export every term end as CSV · Pro

Cleaver Brooks Company Inc.