Also listed on Unizeo Co., Ltd., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Nov 22, 2032 · High confidence
20-year base term ends Nov 22, 2032
Held by Mitsui Kinzoku Company, Limited
Filed Jul 7, 2015 as application 14/793,428 · Granted Feb 20, 2018
Base term, 20 years from filing
Today
2012
2032
Clock starts
Nov 22, 2012
Nov 22, 2012
Term ends
Nov 22, 2032
Nov 22, 2032
Granted
Feb 20, 2018
Feb 20, 2018
base term
fee events
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
2 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
3
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
This patent's term is its 20-year base term, with no adjustment for prosecution delay. 2 of 3 maintenance fees are paid so far. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Nov 22, 2012, when application PCT/JP2012/080308, the earliest non-provisional in its chain, was filed (this one was filed Jul 7, 2015) | Nov 22, 2032 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Nov 22, 2032 | High confidence |
This family
| US 9,238,219 | In force Nov 2032 | Nov 2032 |
| US 9,895,683 | this patent Nov 2032 | Nov 2032 |
2 of 3 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Sep 2, 2015 Reel 36477, frame 780 | Kubota, Yoshihiro; Inagaki, Satoshi; Komatsu, Raita; Itabashi, Keiji; Okubo, Tatsuya; Hieda, Toyohiko | Unizeo Co., Ltd. | Assignment of Assignor's Interest |
| Sep 2, 2015 Reel 36480, frame 633 | Unizeo Co., Ltd. | Unizeo Co., Ltd.; National University Corporation Yokohama National University; The University of Tokyo | Assignment of Assignor's Interest |
| Sep 2, 2015 reel/frame not recorded | Unizeo Co., Ltd. | Unizeo Co., Ltd. | Assignment of Assignor's Interest |
| Sep 2, 2015 reel/frame not recorded | Unizeo Co., Ltd. | National University Corporation Yokohama National University | Assignment of Assignor's Interest |
| Sep 2, 2015 reel/frame not recorded | Unizeo Co., Ltd. | The University of Tokyo | Assignment of Assignor's Interest |
| Jan 23, 2018 Reel 44703, frame 135 | Unizeo Co., Ltd. | Mitsui Mining & Smelting Co., Ltd.; The University of Tokyo; National University Corporation Yokohama National University | Assignment of Assignor's Interest |
| Jan 23, 2018 reel/frame not recorded | Unizeo Co., Ltd. | Mitsui Mining & Smelting Co., Ltd. | Assignment of Assignor's Interest |
| Jan 23, 2018 reel/frame not recorded | Unizeo Co., Ltd. | The University of Tokyo | Assignment of Assignor's Interest |
| Jan 23, 2018 reel/frame not recorded | Unizeo Co., Ltd. | National University Corporation Yokohama National University | Assignment of Assignor's Interest |
| Mar 31, 2026 Reel 75357, frame 342 | Mitsui Mining and Smelting Company, Limited | Mitsui Kinzoku Company, Limited | Change of Name |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Nov 2032
Term ends Nov 22, 2032. Maintenance fees still fall due before then
Citations
4
later US patents cite this one
That is above the median of utility patents granted in 2018 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.