Lapsed Sep 2, 2016 on the fee record · High confidence
20-year base term ended Aug 18, 2024
Second maintenance fee unpaid; grace period ended.
Held by W. R. Grace & Co. - Conn.
Filed Feb 21, 2006 as application 10/568,981 · Granted Sep 2, 2008
Base term, 20 years from filing, plus 19 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 2, 2016
2004
2026
Clock starts
Aug 18, 2004
Aug 18, 2004
No longer in force
Sep 2, 2016
Sep 2, 2016
Granted
Sep 2, 2008
Sep 2, 2008
Term would have run to
Sep 6, 2024
Sep 6, 2024
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
19
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.
99
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 Sep 6, 2024: its 20-year base term plus 19 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 Aug 18, 2004, when application PCT/US2004/026640, the earliest non-provisional in its chain, was filed (this one was filed Feb 21, 2006) | Aug 18, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +19 days, USPTO patent term adjustment record | Sep 6, 2024 | 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 Sep 2, 2016 | High confidence |
| Computed term end | The steps above, in order | Sep 2, 2016 | High confidence |
This family
| US 7,601,664 | Term ended no later than Feb 2022 | no later than Feb 2022 |
| US 7,166,553 | Lapsed on the fee record Jan 2019 | Jan 2019 |
| US 7,141,635 | Lapsed on the fee record Nov 2018 | Nov 2018 |
| US 7,365,039 | Lapsed on the fee record Apr 2020 | Apr 2020 |
| US 7,521,512 | Lapsed on the fee record Apr 2017 | Apr 2017 |
| US 7,491,670 | Term ended Sep 2024 | Sep 2024 |
| US 7,393,806 | Lapsed on the fee record Jul 2016 | Jul 2016 |
| US 7,420,021 | this patent Sep 2016 | Sep 2016 |
8 of 99 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 |
|---|---|---|---|
| Apr 15, 2008 Reel 20803, frame 163 | Chen, Linfeng | Union Carbide Chemicals & Plastics Technology Corporation | Assignment of Assignor's Interest |
| Apr 15, 2008 Reel 20803, frame 245 | Union Carbide Chemicals & Plastics Technology Corporation | Union Carbide Chemicals & Plastics Technology LLC | Change of Name |
| Aug 14, 2008 Reel 21388, frame 547 | Union Carbide Chemicals & Plastics Technology Corporation | Union Carbide Chemicals & Plastics Technology LLC | Change of Name |
| Feb 4, 2014 Reel 32159, frame 384 | W.R. Grace & Co.-Conn. | Goldman Sachs Bank USA, as the Collateral Agent | Security Agreement |
| Mar 28, 2014 Reel 32554, frame 730 | Dow Global Technologies LLC; Union Carbide Chemicals & Plastics Technology LLC | W. R. Grace & Co. Conn. | Assignment of Assignor's Interest |
| Apr 2, 2014 Reel 32589, frame 554 | Dow Global Technologies LLC; Union Carbide Chemicals & Plastics Technology LLC | W. R. Grace & Co. - Conn. | Corrective Assignment to Correct the Assignee Name to "W. R. Grace & Co. - Conn." Previously Recorded on Reel 032554 Frame 0730. Assignor(S) Hereby Confirms the Assignee Name Was Previously Incorrectly Listed in the Recordation Cover Sheet Dated 3/28/2014 as "W. R. Grace & Co. Conn.". |
| Apr 3, 2018 Reel 45832, frame 887 | Goldman Sachs Bank USA, as the Collateral Agent | W.R. Grace & Co.-Conn. | Release of Security Agreement Recorded at Reel/Frame No.: 032159/0384 |
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.
What's changing
Note
The 19 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is below the median of utility patents granted in 2008 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.