Coorstek, Inc.

33 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

Dec 2026

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 Dec 27, 2026
The maintenance fee for Coating methods and materials to reduce aging of SiC hot surface ignitors (US 11,685,699) comes due Dec 27, 2026. Unpaid by Jun 28, 2027, it lapses early.
1 fee due Jan 7, 2027
The maintenance fee for Ceramic to ceramic joint and associated methods (US 9,073,787) comes due Jan 7, 2027. Unpaid by Jul 7, 2027, it lapses early.
1 fee due Sep 15, 2027
The maintenance fee for Igniter shield device and methods associated therewith (US 9,285,120) comes due Sep 15, 2027. Unpaid by Mar 15, 2028, 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.

Patent	Title	Status	Expires	Confidence
US 7,833,469	Preparation of yttria-stabilized zirconia reaction sintered products In force Term ends Dec 4, 2026 · From the USPTO record	In force	Term ends Dec 4, 2026	From the USPTO record
US 8,071,495	Silicon Nitride Body and Method of Manufacture In force Term ends Mar 13, 2028 · High confidence	In force	Term ends Mar 13, 2028	High confidence
US 7,727,919	High Resistivity Silicon Carbide In force Term ends May 1, 2028 · High confidence	In force	Term ends May 1, 2028	High confidence
US D714,369	Wafer paddle In force Term ends Sep 30, 2028 · From the USPTO record	In force	Term ends Sep 30, 2028	From the USPTO record
US D714,370	Wafer paddle In force Term ends Sep 30, 2028 · From the USPTO record	In force	Term ends Sep 30, 2028	From the USPTO record
US D714,371	Wafer paddle In force Term ends Sep 30, 2028 · From the USPTO record	In force	Term ends Sep 30, 2028	From the USPTO record
US 8,058,174	Method for Treating Semiconductor Processing Components and Components Formed Thereby In force Term ends Jun 16, 2029 · High confidence	In force	Term ends Jun 16, 2029	High confidence
US D753,739	Wire bonding wedge tool In force Term ends Apr 12, 2030 · From the USPTO record	In force	Term ends Apr 12, 2030	From the USPTO record
US D771,168	Wire bonding ceramic capillary In force Term ends Nov 8, 2030 · From the USPTO record	In force	Term ends Nov 8, 2030	From the USPTO record
US 8,349,111	Method for joining ceramic components In force Term ends Dec 2, 2030 · From the USPTO record	In force	Term ends Dec 2, 2030	From the USPTO record

10 of 33 patents shown.

Pro members see all 33.

Pro members: see all 33 patents

Also on record, not counted in the 33: 36 lapsed for an unpaid fee · 89 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.

16 no status recorded

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