Surrendered on reissue Mar 20, 2012 · Low confidence
20-year base term ended Mar 22, 2026
Surrendered on reissue Mar 20, 2012 · its term and maintenance fees continue in US RE43,253.
Held by Syntheon Inc.
Filed Aug 13, 2008 as application 12/190,724 · Granted Apr 20, 2010
Base term, 20 years from filing
Today
Surrendered Mar 20, 2012
2006
2026
Clock starts
Mar 22, 2006
Mar 22, 2006
No longer in force
Mar 20, 2012
Mar 20, 2012
Granted
Apr 20, 2010
Apr 20, 2010
Term would have run to
Mar 22, 2026
Mar 22, 2026
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
Not on record
Maintenance fees
USPTO's record of this patent carries no fee events. A gap in the record, not evidence of lapse.
10
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. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. USPTO's record of this patent carries no fee events, so no fee is counted as paid or unpaid. Confidence: Low. 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 Mar 22, 2006, when application 11/387,198, the earliest non-provisional in its chain, was filed (this one was filed Aug 13, 2008) | Mar 22, 2026 | 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 | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | No fee events in USPTO's record of this patent. A gap in the record, not evidence of lapse | no change | Medium confidence |
| Reissue | US RE43,253 issued Mar 20, 2012, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Mar 20, 2012 | High confidence |
| Surrendered on reissue | The steps above, in order | Mar 20, 2012 | Low confidence |
This family
| US 7,644,548 | In force no later than Dec 2027 | no later than Dec 2027 |
| US 7,632,348 | Lapsed on the fee record Dec 2017 | Dec 2017 |
| US 7,658,797 | In force no later than Oct 2027 | no later than Oct 2027 |
| US 7,648,574 | Term ended Mar 2026 | Mar 2026 |
| US 7,699,929 | this patent no later than Mar 2012 | no later than Mar 2012 |
| US 8,029,617 | Term ended Mar 2026 | Mar 2026 |
| US 7,820,094 | Lapsed on the fee record Oct 2022 | Oct 2022 |
| US 8,357,240 | Term ended Mar 2026 | Mar 2026 |
8 of 10 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 |
|---|---|---|---|
| Oct 31, 2012 Reel 29218, frame 1 | Nova Chemicals Inc. | Syntheon Inc. | Assignment of Assignor's 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
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Mar 20, 2012. We will not guess the cap.
Citations
29
later US patents cite this one
That is top 25% of utility patents granted in 2010 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.