312 patents currently held

56 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.

9 more records may belong here and await a decision; they are not counted.

The next term ends in Dec 2026. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Dec 2026

Next term end

297

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 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

Warp-Knitted Fabric and Medical Material US 11,510,768

Cited by 20 later US patents, top 5% of utility patents granted in 2022 in our data. Protection runs to 2037.

Ends May 2037 · High confidence Also notable

Oxygen Concentrating Apparatus and Execution Support Method of Home Oxygen Therapy Using the Same US 7,740,013

The most cited patent in this portfolio, cited by 70 later US patents, top 10% of utility patents granted in 2010 in our data. Protection runs to 2027.

Ends Sep 2027 · High confidence Also notable

Separator for Non-Aqueous Secondary Battery and Non-Aqueous Secondary Battery US 10,074,840

Cited by 13 later US patents, top 25% of utility patents granted in 2018 in our data, and renewed at every maintenance window due so far. Protection runs to 2034.

Ends May 2034 · High confidence

Formerly held, still cited

Notable

Polyolefin Microporous Membrane and Method of Producing the Same, Separator for Non-Aqueous Secondary Battery and Non-Aqueous Secondary Battery US 9,034,509

Renewed at every maintenance window since the 2015 grant; no more fees are due before its term ends in 2031.

now held by Jiangsu Advanced Material Tech Co., Ltd.

Ends Oct 2031 · 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 28, 2026
The maintenance fee for Method for Producing Cut Bodies and Method for Cutting Fiber-Reinforced Resin (US 10,300,621) comes due Nov 28, 2026. Unpaid by May 28, 2027, it lapses early.
7 fees due Dec 6 to 23, 2026 · next Dec 6
8 fees due Jan 4 to 30, 2027 · next Jan 4
5 fees due Feb 4 to 28, 2027 · next Feb 4
5 fees due Mar 5 to 19, 2027 · next Mar 5
9 fees due Apr 1 to 30, 2027 · next Apr 1
4 fees due May 12 to 24, 2027 · next May 12
8 fees due Jun 3 to 30, 2027 · next Jun 3
2 fees due Jul 21 to 30, 2027 · next Jul 21
6 fees due Aug 4 to 23, 2027 · next Aug 4
5 fees due Sep 8 to 19, 2027 · next Sep 8
3 fees due Oct 5 to 14, 2027 · next Oct 5

Which patents, and when each one lapses · Pro

Recent changes

Sep 24Assignment recorded on 5 records: Teijin Limited to Jiangsu Advanced Material Tech Co., Ltd. Recorded Sep 24, 2026, executed Sep 15, 2026. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76131, frame 453.
7 of the patents on this record were granted since Aug 17, 2026
7 terms have ended since Aug 17, 2026

What they patent

The 5 largest of its 297 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Humanized Antibody for Treating or Preventing Cognitive Disorders, Process for Producing the Same, and Agent for Treating or Preventing Cognitive Disorders Using the Same	3 in force	to Feb 2038
Substrate for Composite Membrane	2 in force	to Jun 2040
Prepreg, Method for Producing Same, and Method for Producing Fiber-Reinforced Composite Material	2 in force	to Dec 2039
Carbon Fiber Bundle, Prepreg, and Fiber-Reinforced Composite Material	2 in force	to Feb 2039
Polyester Carbonate and Method for Producing Polyester Carbonate	2 in force	to Jan 2039

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,021,994	Textile Fabric and Protective Clothing Containing the Fabric held by Teijin Aramid GmbH In force Term ends Dec 11, 2026 · High confidence	In force	Term ends Dec 11, 2026	High confidence
US D673,262	Ear Hook for Respiratory Mask In force Term ends Dec 25, 2026 · High confidence	In force	Term ends Dec 25, 2026	High confidence
US D674,081	Ear Plug for Respiratory Mask In force Term ends Jan 8, 2027 · High confidence	In force	Term ends Jan 8, 2027	High confidence
US 7,682,428	Oxygen Concentration Apparatus held by Teijin Pharma Limited In force Term ends Feb 13, 2027 · High confidence	In force	Term ends Feb 13, 2027	High confidence
US 8,263,690	Polylactic Acid Composition In force Term ends Mar 28, 2027 · High confidence	In force	Term ends Mar 28, 2027	High confidence
US 7,740,013	Oxygen Concentrating Apparatus and Execution Support Method of Home Oxygen Therapy Using the Same held by Teijin Pharma Limited In force Term ends Sep 27, 2027 · High confidence	In force	Term ends Sep 27, 2027	High confidence
US 8,299,148	Polylactic Acid Fiber and Manufacturing Method Thereof In force Term ends Oct 29, 2027 · High confidence	In force	Term ends Oct 29, 2027	High confidence
US D693,005	Oxygen Concentrating Apparatus In force Term ends Nov 5, 2027 · High confidence	In force	Term ends Nov 5, 2027	High confidence
US 8,148,542	Method for Producing Crystal Polymorphs of 2-(3-Cyano-4-Isobutyloxyphenyl)-4-Methyl-5-Thiazolecarboxylic Acid held by Teijin Pharma Limited In force Term ends Jan 1, 2028 · High confidence	In force	Term ends Jan 1, 2028	High confidence
US D702,353	Oxygen Concentrating Apparatus In force Term ends Apr 8, 2028 · High confidence	In force	Term ends Apr 8, 2028	High confidence

10 of 312 patents shown.

Pro members see all 312.

Pro members: see all 312 patents

Also on record, not counted in the 312: 56 patents in force now held by others · 351 patents ended · 147 applications pending · 307 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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Teijin Limited