45 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Jun 2029. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
4
Ending by 2030
Jun 2029
Next term end
45
Patent families
When these terms end
Held patents by the year their term ends
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
Ends Dec 2030 · High confidence
Also notable
Ends Aug 2035 · High confidence
Also notable
Ends Mar 2040 · High confidence
Compound Semiconductor Substrate Comprising a Multilayer Buffer Layer
US 8,212,288
The most cited patent in this portfolio, cited by 35 later US patents, top 25% of utility patents granted in 2012 in our data. Protection runs to 2030.
Wavelength Converting Member
US 9,868,270
Cited by 14 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 2035.
Alumina Sintered Body and Manufacturing Method Therefor
US 11,760,694
The newest of the three, granted 2023. It anchors the portfolio to 2040, later than anything else here.
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 2, 2026The maintenance fee for Ceramics Composite (US 9,045,691) comes due Dec 2, 2026. Unpaid by Jun 2, 2027, it lapses early.
- 1 fee due Jan 21, 2027The maintenance fee for Method of Analyzing Nitride Semiconductor Layer and Method of Manufacturing Nitride Semiconductor Substrate Using the Analysis Method (US 9,086,321) comes due Jan 21, 2027. Unpaid by Jul 21, 2027, it lapses early.
- 2 fees due Feb 4 to 25, 2027 · next Feb 4
- 2 fees due Mar 19 to 22, 2027 · next Mar 19
- 2 fees due Aug 11 to 20, 2027 · next Aug 11
- 1 fee due Sep 17, 2027The maintenance fee for Nitride Semiconductor Substrate and Method for Manufacturing the Same (US 10,593,790) comes due Sep 17, 2027. Unpaid by Mar 17, 2028, it lapses early.
Recent changes
- 1 of the patents on this record was granted since Aug 16, 2026
- 1 term has ended since Aug 16, 2026
What they patent
The 3 largest of its 45 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Alumina Sintered Body and Manufacturing Method Therefor | 1 in force | to Mar 2040 |
| Heat Insulator | 1 in force | to Nov 2035 |
| Process for Producing Ceramic Fine Particles, and Ceramic Fine Particle Producing Apparatus Used Therein | 1 in force | to Sep 2029 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,096,826 | Culture Substrate and Culture Method for Undifferentiated Cell and Undifferentiated Cultured Cell In force · High confidence | In force | High confidence | |
| US 8,206,623 | Process for Producing Ceramic Fine Particles, and Ceramic Fine Particle Producing Apparatus Used Therein In force · High confidence | In force | High confidence | |
| US 9,428,728 | Carrier for Undifferentiated Cell Culture and Subculture Method Thereof In force · High confidence | In force | High confidence | |
| US 8,212,288 | Compound Semiconductor Substrate Comprising a Multilayer Buffer Layer In force · High confidence | In force | High confidence | |
| US 8,186,380 | Decompression Apparatus and Inorganic Porous Body In force · High confidence | In force | High confidence | |
| US 8,691,367 | Micro Channel Structure Body and Method of Manufacturing Micro Channel Structure Body In force · High confidence | In force | High confidence | |
| US 8,673,638 | Cell Culture Support and Cell Culture Method In force · High confidence | In force | High confidence | |
| US 8,637,960 | Nitride Semiconductor Substrate In force · High confidence | In force | High confidence | |
| US 8,785,942 | Nitride Semiconductor Substrate and Method of Manufacturing the Same In force · High confidence | In force | High confidence | |
| US 9,045,691 | Ceramics Composite In force · High confidence | In force | High confidence |
Also on record, not counted in the 45: 2 patents ended · 5 applications pending · 1 application 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.