1,029 patents currently held

14 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.

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

The next term ends in Apr 2027. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Apr 2027

Next term end

953

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 2044 2045

notable patents fee due within 90 days all others 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: 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

Apparatus for Treating Substrate US 10,490,427

The newest of the three, granted 2019. It anchors the portfolio to 2036, later than anything else here.

Ends Dec 2036 · High confidence Also notable

Apparatus and Method for Drying Substrates US 8,793,898

Renewed at every maintenance window since the 2014 grant; no more fees are due before its term ends in 2030.

Ends May 2030 · High confidence Also notable

Apparatus and Method of Sensing Leakage of Chemical Liquid US 7,944,363

The largest patent family in this portfolio, 11 related applications, renewed at 3 of 3 maintenance windows. Protection runs to 2029.

Ends Jun 2029 · 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 Substrate Treating Apparatus and Liquid Supplying Method (US 11,664,212) comes due Nov 30, 2026. Unpaid by Jun 1, 2027, it lapses early.
9 fees due Dec 11 to 27, 2026 · next Dec 11
12 fees due Jan 2 to 25, 2027 · next Jan 2
9 fees due Feb 1 to 28, 2027 · next Feb 1
12 fees due Mar 3 to 26, 2027 · next Mar 3
21 fees due Apr 3 to 30, 2027 · next Apr 3
10 fees due May 7 to 28, 2027 · next May 7
9 fees due Jun 5 to 26, 2027 · next Jun 5
19 fees due Jul 2 to 30, 2027 · next Jul 2
13 fees due Aug 6 to 27, 2027 · next Aug 6
18 fees due Sep 1 to 30, 2027 · next Sep 1
12 fees due Oct 7 to 30, 2027 · next Oct 7
4 fees due Nov 7 to 12, 2027 · next Nov 7

Which patents, and when each one lapses · Pro

Recent changes

Nov 10Assignment recorded on 1 record: Seo, Hong Woon to Semes Co., Ltd. Recorded Nov 10, 2026, executed Nov 8, 2024. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76702, frame 752.
Oct 23Assignment recorded on 1 record: Jung, in Ki and 3 others to Semes Co., Ltd. Recorded Oct 23, 2026, executed Oct 11, 2023. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76480, frame 153.
76 of the patents on this record were granted since Aug 16, 2026
1 term has ended since Aug 16, 2026

What they patent

The 5 largest of its 953 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Method and Apparatus for Cleaning Substrates	21 in force	to Jun 2037
Auto Teaching Apparatus Including Test Substrate and Auto Teaching Method Using Distance Measuring Sensor	16 in force	to Apr 2045
Liquid Trap Tank and Liquid Supply Unit for the Liquid Trap Tank	10 in force	to Feb 2045
Dry etcher including etching device and cleaning device	7 in force	to Sep 2031
Substrate Processing Apparatus and Method	5 in force	to Feb 2045

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 7,617,836	System and Method for Supplying Functional Water In force Term ends Apr 23, 2027 · High confidence	In force	Term ends Apr 23, 2027	High confidence
US 7,934,513	Facility with Multi-Storied Process Chamber for Cleaning Substrates and Method for Cleaning Substrates Using the Facility In force Term ends Nov 30, 2027 · High confidence	In force	Term ends Nov 30, 2027	High confidence
US 7,776,142	Bubble Damper of Slurry Supply Apparatus In force Term ends Jun 18, 2028 · High confidence	In force	Term ends Jun 18, 2028	High confidence
US 7,618,599	Reaction Chamber for Manufacturing a Carbon Nanotube, Apparatus for Manufacturing the Carbon Nanotube and System for Manufacturing the Carbon Nanotube In force Term ends Jun 20, 2028 · High confidence	In force	Term ends Jun 20, 2028	High confidence
US 8,007,634	Wafer Spin Chuck and an Etcher Using the Same In force Term ends Jun 29, 2028 · High confidence	In force	Term ends Jun 29, 2028	High confidence
US 7,802,579	Apparatus and Method for Treating Substrates In force Term ends Aug 31, 2028 · High confidence	In force	Term ends Aug 31, 2028	High confidence
US 7,784,998	Method for Liquid Mixing Supply In force Term ends Oct 7, 2028 · High confidence	In force	Term ends Oct 7, 2028	High confidence
US 7,775,222	Single Substrate Cleaning Apparatus and Method for Cleaning Backside of Substrate In force Term ends Oct 10, 2028 · High confidence	In force	Term ends Oct 10, 2028	High confidence
US 8,033,378	Buffer System for Adjusting First-In First-Out In force Term ends Nov 7, 2028 · High confidence	In force	Term ends Nov 7, 2028	High confidence
US 7,900,853	Apparatus for Supplying Chemical Liquid In force Term ends Feb 24, 2029 · High confidence	In force	Term ends Feb 24, 2029	High confidence

10 of 1,029 patents shown.

Pro members see all 1,029.

Pro members: see all 1,029 patents

Also on record, not counted in the 1,029: 14 patents in force now held by others · 25 patents ended · 572 applications pending · 228 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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Semes Co., Ltd.