1,012 patents currently held

46 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 Dec 2026. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

189

Ending by 2030

Dec 2026

Next term end

851

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 2044 2045

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

Aromatic Amine Derivative, and Organic Electroluminescent Element Comprising Same US 8,431,250

Cited by 79 later US patents, top 10% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030. 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 May 2030 · Medium confidence Also notable

Compound, Material for Organic Electroluminescent Elements, Organic Electroluminescent Element, and Electronic Device US 10,590,080

Cited by 24 later US patents, top 10% of utility patents granted in 2020 in our data. Protection runs to 2035.

Ends Aug 2035 · High confidence Also notable

Aromatic Amine Derivative, and Organic Electroluminescent Element Using Same US 10,014,477

Cited by 34 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 2034.

Ends Jun 2034 · High confidence

Formerly held, still cited

Notable

Organic Electroluminescent Device Using Aryl Amine Derivative Containing Heterocycle US 10,263,192

Cited by 88 later US patents, top 5% of utility patents granted in 2019 in our data, and renewed at 2 of 3 maintenance windows. Protection runs to 2030.

now held by Jdi Design and Development G.K.

Ends Jan 2030 · 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 30, 2026
8 fees due Dec 2 to 30, 2026 · next Dec 2
17 fees due Jan 2 to 28, 2027 · next Jan 2
17 fees due Feb 4 to 28, 2027 · next Feb 4
22 fees due Mar 1 to 29, 2027 · next Mar 1
14 fees due Apr 6 to 30, 2027 · next Apr 6
14 fees due May 3 to 24, 2027 · next May 3
20 fees due Jun 1 to 26, 2027 · next Jun 1
5 fees due Jul 7 to 28, 2027 · next Jul 7
16 fees due Aug 4 to 27, 2027 · next Aug 4
10 fees due Sep 1 to 26, 2027 · next Sep 1
17 fees due Oct 2 to 30, 2027 · next Oct 2
8 fees due Nov 3 to 12, 2027 · next Nov 3

Which patents, and when each one lapses · Pro

Recent changes

Nov 2Assignment recorded on 1 record: Ishitobi, Yuma and 1 other to Idemitsu Kosan Co.,Ltd. Recorded Nov 2, 2026, executed Oct 14, 2026. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76589, frame 943.
Sep 21Assignment recorded on 1 record: Masuda, Tetsuya and 1 other to Idemitsu Kosan Co.,Ltd. Recorded Sep 21, 2026, executed Jun 23, 2023. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76093, frame 321.
22 of the patents on this record were granted since Aug 17, 2026
13 terms have ended since Aug 17, 2026

What they patent

The 5 largest of its 851 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Aromatic Amine Derivative and Electroluminescence Device Using the Same	10 in force	to Dec 2029
Organic Electroluminescence Device and Novel Compound	7 in force	to Apr 2040
Aromatic Heterocyclic Derivative, Material for Organic Electroluminescent Element, and Organic Electroluminescent Element	7 in force	to Dec 2033
Aromatic Amine Derivative, and Organic Electroluminescent Element Comprising Same	7 in force	to Jul 2031
Material for Organic Electroluminescence Device and Organic Electroluminescence Device Using the Same	7 in force	to Aug 2030

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,043,523	Refrigerating-Machine Oil Composition, and Compressor for Refrigerating Machine and Refrigerating Apparatus Each Employing the Same In force Term ends Dec 19, 2026 · High confidence	In force	Term ends Dec 19, 2026	High confidence
US 7,998,372	Semiconductor Thin Film, Method for Manufacturing the Same, Thin Film Transistor, and Active-Matrix-Driven Display Panel In force Term ends Dec 21, 2026 · High confidence	In force	Term ends Dec 21, 2026	High confidence
US 7,777,413	Organic Electroluminescent Device Having an Optical Resonator In force Term ends Jan 18, 2027 · High confidence	In force	Term ends Jan 18, 2027	High confidence
US 7,528,542	Organic Electroluminescent Device In force Term ends Feb 5, 2027 · High confidence	In force	Term ends Feb 5, 2027	High confidence
US 7,662,487	Azaaromatic Compounds Having Azafluoranthene Skeletons and Organic Electroluminescent Devices Made by Using the Same In force Term ends Feb 7, 2027 · High confidence	In force	Term ends Feb 7, 2027	High confidence
US 7,651,791	Material for Organic Electroluminescence Device and Electroluminescence Device Employing the Same In force Term ends Feb 16, 2027 · High confidence	In force	Term ends Feb 16, 2027	High confidence
US 7,737,069	Magnesium Compound, Catalyst for Olefin Polymerization and Method for Producing Olefin Polymer In force Term ends Mar 24, 2027 · High confidence	In force	Term ends Mar 24, 2027	High confidence
US 8,137,577	Refrigerator Oil Composition, and Refrigerator Compressor and Refrigeration System Using the Composition In force Term ends Mar 26, 2027 · High confidence	In force	Term ends Mar 26, 2027	High confidence
US 7,888,865	Organic Electroluminescent Device and Display Having Multiple Emitting Layers In force Term ends Apr 2, 2027 · High confidence	In force	Term ends Apr 2, 2027	High confidence
US 8,623,522	Aromatic Amine Derivative and Electroluminescence Device Using the Same In force Term ends Apr 4, 2027 · High confidence	In force	Term ends Apr 4, 2027	High confidence

10 of 1,012 patents shown.

Pro members see all 1,012.

Pro members: see all 1,012 patents

Also on record, not counted in the 1,012: 46 patents in force now held by others · 615 patents ended · 501 applications pending · 901 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

Idemitsu Kosan Co., Ltd.