129 patents currently held

30 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.

1 more record may belong here and awaits a decision; it is not counted.

The next term ends in Jan 2027. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Jan 2027

Next term end

129

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027 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 15, 2026 · includes USPTO assignment & status data published Nov 15, 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 the Parallel Production of Hydrogen and Carbon-Containing Products US 9,359,200

Cited by 19 later US patents, top 25% of utility patents granted in 2016 in our data, and renewed at every maintenance window due so far. Protection runs to 2032.

Ends Aug 2032 · High confidence Also notable

Column with Angular Profiles US 10,201,765

Granted 2019. Computed term ends 2035.

Ends Jun 2035 · High confidence Also notable

Large-Scale Hydrogen Liquefaction by Means of a High Pressure Hydrogen Refrigeration Cycle Combined to a Novel Single Mixed-Refrigerant Precooling US 10,928,127

The newest of the three, granted 2021. It anchors the portfolio to 2036, later than anything else here.

Ends Oct 2036 · High confidence

Formerly held, still cited

Notable

Method for Producing a Metal Workpiece in Layers by Means of Laser-Assisted Additive Manufacturing US 11,717,891

Cited by 14 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2037.

now held by Messer Industries USA, Inc.

Ends Mar 2037 · High confidence

Also notable

Catalyst Composition and Process for Di-, Tri-And/Or Tetramerization of Ethylene US 8,637,721

The most cited patent in this portfolio, cited by 24 later US patents, top 25% of utility patents granted in 2014 in our data. Protection runs to 2030.

now held by SABIC Global Technologies B.V.

Ends Apr 2030 · High confidence

Also notable

Refrigeration Circuit and Method for Operating a Refrigeration Circuit US 8,113,008

Renewed at every maintenance window since the 2012 grant; no more fees are due before its term ends in 2028.

now held by Carrier Corporation

Ends Apr 2028 · 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 16 to 25, 2027 · next Jan 16
2 fees due Feb 8 to 13, 2027 · next Feb 8
3 fees due Apr 3 to 24, 2027 · next Apr 3
2 fees due May 7 to 28, 2027 · next May 7
3 fees due Jun 5 to 19, 2027 · next Jun 5
1 fee due Jul 9, 2027
The maintenance fee for Method and Device for Feeding Gas to an Additive Manufacturing Space (US 11,865,614) comes due Jul 9, 2027. Unpaid by Jan 10, 2028, it lapses early.
3 fees due Aug 6 to 23, 2027 · next Aug 6
4 fees due Sep 5 to 15, 2027 · next Sep 5
1 fee due Oct 16, 2027
The maintenance fee for Air Separation Unit and Method for Production of High Purity Nitrogen Product Using a Distillation Column System with an Intermediate Pressure Kettle Column (US 11,959,701) comes due Oct 16, 2027. Unpaid by Apr 17, 2028, it lapses early.
1 fee due Nov 7, 2027
The maintenance fee for Method and Installation for Low Temperature Separation of Air (US 11,976,880) comes due Nov 7, 2027. Unpaid by May 8, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

15 of the patents on this record were granted since Aug 17, 2026
2 terms have ended since Aug 17, 2026

What they patent

The 5 largest of its 129 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Plasma Arc Torch with Focus Hole Alignment	1 in force	to Nov 2043
Method for Operating a Process Plant	1 in force	to Sep 2043
Cryogenic Air Rectification System, Control Unit, Air Separation Unit and Method of Cryogenically Separating Air	1 in force	to Aug 2043
Method and System for Steamcracking	1 in force	to Aug 2043
Reactor for Carrying Out a Chemical Reaction	1 in force	to Jul 2043

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,093,439	Method for Oligomerization And/Or Polymerization of Ethylene with Flushing of Equipment and Piping held by Saudi Basic Industries Corporation and Linde AG In force Term ends Jan 9, 2027 · High confidence	In force	Term ends Jan 9, 2027	High confidence
US 8,058,369	Method for Operating Bubble Column Reactor for the Oligomerization of Ethylene held by Saudi Basic Industries Corporation and Linde AG In force Term ends Oct 5, 2027 · High confidence	In force	Term ends Oct 5, 2027	High confidence
US 9,012,577	Method for Preparing Linear Alpha-Olefins With Improved Heat Removal held by Saudi Basic Industries Corporation and Linde AG In force Term ends Nov 28, 2027 · High confidence	In force	Term ends Nov 28, 2027	High confidence
US D720,114	Fork-Lift Truck held by Linde Material Handling GmbH In force Term ends Dec 23, 2028 · High confidence	In force	Term ends Dec 23, 2028	High confidence
US 10,234,174	Apparatus And Method For Flameless Thermal Oxidation At Optimized Equivalence Ratios held by Linde Engineering North America Inc. In force Term ends Mar 11, 2029 · Medium confidence	In force	Term ends Mar 11, 2029	Medium confidence
US 8,809,613	Method for Preparing Linear Alpha-Olefins held by Saudi Basic Industries Corporation and Linde AG In force Term ends May 28, 2030 · High confidence	In force	Term ends May 28, 2030	High confidence
US 9,593,055	Method for Preparing Linear Alpha-Olefins held by Saudi Basic Industries Corporation and Linde AG In force Term ends Nov 20, 2030 · High confidence	In force	Term ends Nov 20, 2030	High confidence
US D776,898	Forklift Mast Mounting held by Linde Material Handling GmbH In force Term ends Jan 17, 2031 · High confidence	In force	Term ends Jan 17, 2031	High confidence
US 9,003,829	Nitrogen Removal from Natural Gas In force Term ends Aug 5, 2031 · High confidence	In force	Term ends Aug 5, 2031	High confidence
US D778,522	Fork-Lift Truck held by Linde Material Handling GmbH In force Term ends Feb 7, 2032 · High confidence	In force	Term ends Feb 7, 2032	High confidence

10 of 129 patents shown.

Pro members see all 129.

Pro members: see all 129 patents

Also on record, not counted in the 129: 30 patents in force now held by others · 45 patents ended · 154 applications pending · 87 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.

Export every term end as CSV · Pro

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