Collateral for a security interest recorded Mar 12, 2021 (HSBC Bank USA, National Association).
Lapsed May 12, 2023 on the fee record · High confidence
20-year base term ends Oct 1, 2027
Second maintenance fee unpaid; grace period ended.
Held by Tronox LLC
Filed Oct 1, 2007 as application 11/906,259 · Granted May 12, 2015
Base term, 20 years from filing, plus 1641 days of patent term adjustment (USPTO delay)
Today
Lapsed May 12, 2023
2007
2032
Clock starts
Oct 1, 2007
Oct 1, 2007
No longer in force
May 12, 2023
May 12, 2023
Granted
May 12, 2015
May 12, 2015
Term would have run to
Mar 29, 2032
Mar 29, 2032
base term
patent term adjustment
after the term ends
fee events
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
1,641
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
23
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Mar 29, 2032: its 20-year base term plus 1641 days of term adjustment for prosecution delay. 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 Oct 1, 2007, when this application, 11/906,259, was filed | Oct 1, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1641 days, USPTO patent term adjustment record | Mar 29, 2032 | 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 | 1 of 3 maintenance fees paid | lapsed May 12, 2023 | High confidence |
| Computed term end | The steps above, in order | May 12, 2023 | High confidence |
This family
| US 7,264,672 | Term ended Oct 2026 | Oct 2026 |
| US 7,622,097 | In force Jan 2028 | Jan 2028 |
| US 9,028,913 | this patent May 2023 | May 2023 |
| US 7,717,999 | In force Dec 2028 | Dec 2028 |
| US 8,226,911 | In force Oct 2030 | Oct 2030 |
| US 8,057,770 | In force Jul 2027 | Jul 2027 |
| US 8,178,065 | In force Oct 2030 | Oct 2030 |
| US 7,824,322 | Lapsed on the fee record Nov 2022 | Nov 2022 |
8 of 23 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 |
|---|---|---|---|
| Nov 20, 2007 Reel 20145, frame 87 | Bashir, Sami M.; Trabzuni, Fadi Mohammed Saeed; Yaser, Ahmed V. | National Titanium Dioxide Co., Ltd. (Cristal) | Assignment of Assignor's Interest |
| Jun 25, 2019 Reel 49583, frame 638 | The National Titanium Dioxide Co. Ltd. (Cristal) | Tronox LLC | Assignment of Assignor's Interest |
| May 1, 2020 Reel 52554, frame 529 | Tronox LLC | Wilmington Trust, National Association, as Collateral Agent | Security Interest |
| Mar 12, 2021 Reel 55579, frame 619 | Tronox LLC | HSBC Bank USA, National Association, as Collateral Agent | Security Interest |
| Apr 7, 2022 Reel 59629, frame 581 | Wilmington Trust, National Association | Tronox LLC | Release of Security Interest |
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
Note
The 1641 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
2
later US patents cite this one
That is below the median of utility patents granted in 2015 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.