276 patents currently held

15 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.

2 more records may belong here and await a decision; they are 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.

103

Ending by 2030

Jan 2027

Next term end

214

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 204320442045

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

Heat Transfer Fluid Replacing R-410A US 9,011,711

The most cited patent in this portfolio, cited by 101 later US patents, top 5% of utility patents granted in 2015 in our data. Protection runs to 2029. A terminal disclaimer caps this term to an earlier patent's.

Ends May 2029 · High confidence Also notable

Use of R-1233 in Liquid Chillers US 8,703,690

Cited by 43 later US patents, top 25% of utility patents granted in 2014 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030.

Ends Dec 2030 · High confidence Also notable

Process for the Manufacture of Hydrochlorofluoroolefins US 8,987,535

Cited by 25 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029. 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 Nov 2029 · Low 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.

4 fees due Nov 21 to 30, 2026 · next Nov 21
9 fees due Dec 2 to 23, 2026 · next Dec 2
6 fees due Jan 2 to 30, 2027 · next Jan 2
5 fees due Feb 11 to 27, 2027 · next Feb 11
2 fees due Mar 1 to 3, 2027 · next Mar 1
5 fees due Apr 3 to 30, 2027 · next Apr 3
2 fees due May 10 to 14, 2027 · next May 10
8 fees due Jun 1 to 30, 2027 · next Jun 1
10 fees due Jul 2 to 19, 2027 · next Jul 2
8 fees due Aug 2 to 27, 2027 · next Aug 2
7 fees due Sep 8 to 26, 2027 · next Sep 8
5 fees due Oct 5 to 28, 2027 · next Oct 5
1 fee due Nov 3, 2027
The maintenance fee for Caustic Resistant Membrane (US 9,327,247) comes due Nov 3, 2027. Unpaid by May 3, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

Oct 13Assignment recorded on 1 record: Fu, Tsung-Hao and 3 others to Arkema Inc. Recorded Oct 13, 2026, executed Oct 9, 2026. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76344, frame 975.
Oct 2Assignment recorded on 1 record: Buitrago, Francisco and 1 other to Arkema Inc. Recorded Oct 2, 2026, executed Oct 1, 2026. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76235, frame 27.
5 of the patents on this record were granted since Aug 17, 2026
5 terms have ended since Aug 17, 2026

What they patent

The 5 largest of its 214 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Composite Polymer Modifiers	5 in force	to Jul 2037
Shell and Tube Oxidation Reactor with Improved Resistance to Fouling	4 in force	to Jan 2034
Heat Treated Polymer Powders	4 in force	to Dec 2032
Aqueous Polyvinylidene Fluoride Composition	4 in force	to Dec 2031
Use of R-1233 in Liquid Chillers	4 in force	to Dec 2030

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 7,572,862	Reduced Melt Viscosity Rigid Polyvinylchloride (PVC) Composition In force Term ends Jan 10, 2027 · High confidence	In force	Term ends Jan 10, 2027	High confidence
US 8,697,822	Polymerization of Fluoropolymers Using Non-Fluorinated Surfactants In force Term ends Feb 5, 2027 · High confidence	In force	Term ends Feb 5, 2027	High confidence
US 7,666,946	Blends of Biopolymers with Acrylic Copolymers In force Term ends Feb 25, 2027 · High confidence	In force	Term ends Feb 25, 2027	High confidence
US 8,029,718	Process for Forming Multi-Layer Molded Articles In force Term ends Apr 4, 2027 · High confidence	In force	Term ends Apr 4, 2027	High confidence
US 7,485,598	High Pressure Catalyst Activation Method and Catalyst Produced Thereby In force Term ends Apr 22, 2027 · High confidence	In force	Term ends Apr 22, 2027	High confidence
US 7,504,151	Thermoplastics Permeation, Resistant Multi-Layers for Air Conditioning Hose Application Using Nanofillers Technology In force Term ends Apr 28, 2027 · High confidence	In force	Term ends Apr 28, 2027	High confidence
US 7,700,700	Vinylidene Fluoride Copolymer Composition with Improved Low-Temperature Impact Properties In force Term ends Jun 8, 2027 · High confidence	In force	Term ends Jun 8, 2027	High confidence
US 7,691,797	Controlled Radical Acrylic Copolymer Thickeners In force Term ends Jun 27, 2027 · High confidence	In force	Term ends Jun 27, 2027	High confidence
US 7,705,091	Method of Increasing the Absorption Rate of Peroxides into Polymer Particles In force Term ends Jul 1, 2027 · High confidence	In force	Term ends Jul 1, 2027	High confidence
US 8,338,518	Aqueous Process for Making a Stable Fluoropolymer Dispersion In force Ends no later than Jul 6, 2027 · Medium confidence	In force	Ends no later than Jul 6, 2027	Medium confidence

10 of 276 patents shown.

Pro members see all 276.

Pro members: see all 276 patents

Also on record, not counted in the 276: 15 patents in force now held by others · 232 patents ended · 82 applications pending · 233 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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Arkema Inc.