Seven patents currently held, every record listed here
1 more in force is now held by another company
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Oct 2032. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Oct 2032
Next term end
6
Patent families
When these terms end
Each bar runs from grant to computed term end. 2013 to 2043.
US 8,603,412
Microchannel Structure, and Methods for Producing Emulsion and Solid Spherical Particles
Nov 12, 2030
US 12,662,385
Hydrophobic Silica Particles, Use of Same, and Method for Producing Hydrophobic Silica Particles
Jan 19, 2042
US 12,459,826
Hollow Silica Particles and Method for Manufacturing Hollow Silica Particles
Sep 18, 2042
US 12,521,323
Hydroxyapatite-Supporting Porous Silica Particles, Method for Producing Hydroxyapatite-Supporting Porous Silica Particles, and Composition Comprising Hydroxyapatite-Supporting Porous Silica Particles
Dec 26, 2042
20192025203120372043
14 pending applications: term is not computable until grant.Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends Nov 2039 · High confidence
Also notable
Ends Oct 2032 · High confidence
Also notable
Ends Jan 2042 · High confidence
Method for Producing Hollow Silica Particles
US 11,608,273
Granted 2023. Computed term ends 2039.
Silica Spheres and Affinity Carrier
US 9,192,914
Granted 2015 and renewed at every maintenance window due so far. Protection runs to 2032.
Hydrophobic Silica Particles, Use of Same, and Method for Producing Hydrophobic Silica Particles
US 12,662,385
Granted 2026. Too new for citation comparison; protection runs to 2042.
Formerly held, still cited
Notable
Ends Nov 2030 · High confidence
Renewed at every maintenance window since the 2013 grant; no more fees are due before its term ends in 2030.
now held by AGC Inc.
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 May 24, 2027The maintenance fee for Silica Spheres and Affinity Carrier (US 9,192,914) comes due May 24, 2027. Unpaid by Nov 24, 2027, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 5 largest of its 6 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
Patents held now
Soonest term end first.
Showing 1 to 7 of 7
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,192,914 | Silica Spheres and Affinity Carrier In force · High confidence | In force | High confidence | |
| US 12,157,673 | Method for Producing Hollow Silica Particles held by AGC Inc. In force · High confidence | In force | High confidence | |
| US 11,608,273 | Method for Producing Hollow Silica Particles held by AGC Inc. and AGC Si-Tech Co., Ltd. In force · High confidence | In force | High confidence | |
| US 12,662,385 | Hydrophobic Silica Particles, Use of Same, and Method for Producing Hydrophobic Silica Particles In force · High confidence | In force | High confidence | |
| US 12,459,826 | Hollow Silica Particles and Method for Manufacturing Hollow Silica Particles held by AGC Inc. and AGC Si-Tech Co., Ltd. In force · High confidence | In force | High confidence | |
| US 12,521,323 | Hydroxyapatite-Supporting Porous Silica Particles, Method for Producing Hydroxyapatite-Supporting Porous Silica Particles, and Composition Comprising Hydroxyapatite-Supporting Porous Silica Particles In force · High confidence | In force | High confidence | |
| US 12,662,386 | Hollow Silica Particles and Method for Producing the Same held by AGC Inc. and AGC Si-Tech Co., Ltd. In force · High confidence | In force | High confidence |
Also on record, not counted in the 7: 1 patent in force now held by others · 2 patents ended · 14 applications pending · 4 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.