Term ends Mar 4, 2031 · High confidence
20-year base term ends Dec 16, 2030
Held by Synopsys, Inc.
Filed Dec 16, 2010 as application 12/970,888 · Granted Mar 26, 2013
Base term plus 78 days of patent term adjustment (USPTO delay)
Today
2010
2031
Clock starts
Dec 16, 2010
Dec 16, 2010
Term ends
Mar 4, 2031
Mar 4, 2031
Granted
Mar 26, 2013
Mar 26, 2013
base term
patent term adjustment
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
78
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
6
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 runs 78 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Dec 16, 2010, when this application, 12/970,888, was filed | Dec 16, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +78 days, USPTO patent term adjustment record | Mar 4, 2031 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 4, 2031 | High confidence |
This family
| US 8,407,647 | this patent Mar 2031 | Mar 2031 |
| US 8,522,176 | In force Jan 2032 | Jan 2032 |
| US 8,832,632 | In force Oct 2032 | Oct 2032 |
| US 8,875,081 | In force Dec 2030 | Dec 2030 |
| US 8,924,912 | In force May 2031 | May 2031 |
| US 9,665,679 | In force Dec 2030 | Dec 2030 |
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 |
|---|---|---|---|
| Dec 16, 2010 reel/frame not recorded | Chang, Fong-yuan; Mak, Wai-kei; Tsay, Ren-song; Chen, Sheng-hsiung; Chen, Tung-chieh | Springsoft, Inc. | Assignment of Assignor's Interest |
| Dec 16, 2010 reel/frame not recorded | Chang, Fong-yuan; Mak, Wai-kei; Tsay, Ren-song; Chen, Sheng-hsiung; Chen, Tung-chieh | Springsoft USA, Inc. | Assignment of Assignor's Interest |
| Dec 16, 2010 Reel 25515, frame 124 | Chang, Fong-yuan; Chen, Sheng-hsiung; Chen, Tung-chieh; Tsay, Ren-song; Mak, Wai-kei | Springsoft, Inc.; Springsoft USA, Inc. | Assignment of Assignor's Interest |
| Jul 17, 2013 Reel 30820, frame 490 | Springsoft USA, Inc. | Synopsys, Inc. | Assignment of Assignor's Interest |
| Jul 18, 2013 Reel 30831, frame 119 | Springsoft, Inc. | Synopsys Taiwan Co., Ltd. | Acquisition |
| Mar 31, 2016 Reel 38320, frame 364 | Synopsys Taiwan Co., Ltd. | Synopsys, 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
Mar 2031
Term ends Mar 4, 2031. No further fees fall due before then
Note
The 78 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
92
later US patents cite this one
That is top 10% of utility patents granted in 2013 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.