Maintenance fees coming due

Coorstek GK

9 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Dec 2, 2026. Unpaid by Jun 2, 2027, that one lapses early.

A maintenance fee does not end a patent on its due date. It falls due at 3.5, 7.5 and 11.5 years from grant, and the patent lapses only if the fee is still unpaid at the end of the six month grace period that follows.

Patent	Title	Holder	Status	Fee due	Lapses if unpaid	Expires	Confidence
US 9,045,691	Ceramics Composite Coorstek GK In force Fee due Dec 2, 2026 Lapses if unpaid Jun 2, 2027 Term ends Aug 3, 2033 · High confidence	Coorstek GK	In force	Dec 2, 2026	Jun 2, 2027	Term ends Aug 3, 2033	High confidence
US 9,086,321	Method of Analyzing Nitride Semiconductor Layer and Method of Manufacturing Nitride Semiconductor Substrate Using the Analysis Method Coorstek GK In force Fee due Jan 21, 2027 Lapses if unpaid Jul 21, 2027 Term ends Oct 18, 2033 · High confidence	Coorstek GK	In force	Jan 21, 2027	Jul 21, 2027	Term ends Oct 18, 2033	High confidence
US 9,096,826	Culture Substrate and Culture Method for Undifferentiated Cell and Undifferentiated Cultured Cell Coorstek GK In force Fee due Feb 4, 2027 Lapses if unpaid Aug 4, 2027 Term ends Jun 24, 2029 · High confidence	Coorstek GK	In force	Feb 4, 2027	Aug 4, 2027	Term ends Jun 24, 2029	High confidence
US 9,117,743	Nitride Semiconductor Substrate Coorstek GK In force Fee due Feb 25, 2027 Lapses if unpaid Aug 25, 2027 Term ends May 7, 2034 · High confidence	Coorstek GK	In force	Feb 25, 2027	Aug 25, 2027	Term ends May 7, 2034	High confidence
US 11,760,694	Alumina Sintered Body and Manufacturing Method Therefor Coorstek GK In force Fee due Mar 19, 2027 Lapses if unpaid Sep 20, 2027 Term ends Mar 27, 2040 · High confidence	Coorstek GK	In force	Mar 19, 2027	Sep 20, 2027	Term ends Mar 27, 2040	High confidence
US 9,139,448	Heat-Insulating Material Coorstek GK In force Fee due Mar 22, 2027 Lapses if unpaid Sep 22, 2027 Term ends Nov 28, 2033 · High confidence	Coorstek GK	In force	Mar 22, 2027	Sep 22, 2027	Term ends Nov 28, 2033	High confidence
US 10,559,679	Nitride Semiconductor Epitaxial Substrate Coorstek GK In force Fee due Aug 11, 2027 Lapses if unpaid Feb 11, 2028 Term ends Aug 17, 2038 · High confidence	Coorstek GK	In force	Aug 11, 2027	Feb 11, 2028	Term ends Aug 17, 2038	High confidence
US 11,905,219	Alumina Ceramic Coorstek GK In force Fee due Aug 20, 2027 Lapses if unpaid Feb 22, 2028 Term ends Sep 25, 2041 · High confidence	Coorstek GK	In force	Aug 20, 2027	Feb 22, 2028	Term ends Sep 25, 2041	High confidence
US 10,593,790	Nitride Semiconductor Substrate and Method for Manufacturing the Same Coorstek GK In force Fee due Sep 17, 2027 Lapses if unpaid Mar 17, 2028 Term ends Mar 24, 2038 · High confidence	Coorstek GK	In force	Sep 17, 2027	Mar 17, 2028	Term ends Mar 24, 2038	High confidence

9 of 9 patents shown. Soonest fee due date first, then patent number.

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