Stek Co., Ltd.

10 patents currently held · Updated Nov 14, 2026

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

Ending by 2030

Sep 2037

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

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 Jan 9, 2027
The maintenance fee for Optical system and method for inspecting a transparent plate (US 10,345,248) comes due Jan 9, 2027. Unpaid by Jul 9, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 of the patents on this record was granted since Aug 16, 2026
1 term has ended since Aug 16, 2026

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Showing 1 to 10 of 10

Patent	Title	Status	Expires	Confidence
US 10,241,057	Optical inspecting apparatus with an optical screening device In force Term ends Sep 6, 2037 · From the USPTO record	In force	Term ends Sep 6, 2037	From the USPTO record
US 10,345,248	Optical system and method for inspecting a transparent plate In force Term ends Sep 6, 2037 · From the USPTO record	In force	Term ends Sep 6, 2037	From the USPTO record
US 11,123,775	Apparatus and method for cleaning substrates In force Term ends Apr 30, 2038 · From the USPTO record	In force	Term ends Apr 30, 2038	From the USPTO record
US 11,660,847	Protective film for windshield of vehicle In force Term ends Nov 25, 2040 · From the USPTO record	In force	Term ends Nov 25, 2040	From the USPTO record
US 11,447,664	Color wrapping film for vehicle In force Term ends Jun 14, 2041 · From the USPTO record	In force	Term ends Jun 14, 2041	From the USPTO record
US 12,202,234	Exterior film of building for protecting glass In force Term ends Jun 9, 2042 · From the USPTO record	In force	Term ends Jun 9, 2042	From the USPTO record
US 12,023,997	Window film for vehicles including graphene In force Term ends Feb 28, 2043 · From the USPTO record	In force	Term ends Feb 28, 2043	From the USPTO record
US 12,668,042	Protective Film for Vehicle Glass with Heat Shielding Function, and Method for Manufacturing the Same In force Term ends Aug 17, 2044 · High confidence	In force	Term ends Aug 17, 2044	High confidence
US 12,710,701	Mask Inspection Apparatus In force Term ends Jan 5, 2045 · High confidence	In force	Term ends Jan 5, 2045	High confidence
US 12,669,757	Mask Inspection Apparatus with a Platform Module In force Term ends Jan 7, 2045 · High confidence	In force	Term ends Jan 7, 2045	High confidence

Also on record, not counted in the 10: 1 lapsed for an unpaid fee · 1 ended at full term. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

2 abandoned · 6 no status recorded

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