Lapsed Dec 23, 2022 on the fee record · High confidence

Computed 20-year base term

Second maintenance fee unpaid; grace period ended.

Held by GM Global Technology Operations LLC

Filed Apr 24, 2008 as application 12/108,581 · Granted Dec 23, 2014

Base term, 20 years from filing, plus 1323 days of patent term adjustment (USPTO delay)

Today

Lapsed Dec 23, 2022

2008 2031

Clock starts
Apr 24, 2008

No longer in force
Dec 23, 2022

Granted
Dec 23, 2014

Term would have run to
Dec 8, 2031

base term patent term adjustment after the term ends 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

1,323

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.

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 Dec 8, 2031: its 20-year base term plus 1323 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 Apr 24, 2008, when this application, 12/108,581, was filed	Apr 24, 2028	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+1323 days, USPTO patent term adjustment record	Dec 8, 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	1 of 3 maintenance fees paid	lapsed Dec 23, 2022	High confidence
Computed term end	The steps above, in order	Dec 23, 2022	High confidence

This family

US 8,917,904	this patent Dec 2022	Dec 2022
US 8,634,593	In force Nov 2030	Nov 2030
US 8,452,053	In force Feb 2031	Feb 2031
US 8,803,966	In force Aug 2031	Aug 2031
US 8,421,859	In force Mar 2030	Mar 2030
US 8,332,134	In force Oct 2029	Oct 2029
US 8,699,754	In force May 2030	May 2030
US 8,487,991	In force Jul 2030	Jul 2030

8 of 15 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
Jun 25, 2008 Reel 21149, frame 368	Zhang, Wende; Wolski, Mark J.	GM Global Technology Operations, Inc.	Assignment of Assignor's Interest
Feb 4, 2009 Reel 22201, frame 448	GM Global Technology Operations, Inc.	United States Department of the Treasury	Security Agreement
Apr 16, 2009 reel/frame not recorded	GM Global Technology Operations, Inc.	Citicorp USA, Inc. as Agent for Bank Priority Secured Parties	Security Agreement
Apr 16, 2009 reel/frame not recorded	GM Global Technology Operations, Inc.	Citicorp USA, Inc. as Agent for Hedge Priority Secured Parties	Security Agreement
Apr 16, 2009 Reel 22554, frame 479	GM Global Technology Operations, Inc.	Citicorp USA, Inc. as Agent for Bank Priority Secured Parties; Citicorp USA, Inc. as Agent for Hedge Priority Secured Parties	Security Agreement
Aug 20, 2009 Reel 23124, frame 670	United States Department of the Treasury	GM Global Technology Operations, Inc.	Release of Security Interest
Aug 21, 2009 Reel 23155, frame 880	Citicorp USA, Inc. as Agent for Bank Priority Secured Parties; Citicorp USA, Inc. as Agent for Hedge Priority Secured Parties	GM Global Technology Operations, Inc.	Release of Security Interest
Aug 27, 2009 Reel 23156, frame 215	GM Global Technology Operations, Inc.	United States Department of the Treasury	Security Agreement
Aug 28, 2009 Reel 23162, frame 187	GM Global Technology Operations, Inc.	Uaw Retiree Medical Benefits Trust	Security Agreement
Nov 4, 2010 Reel 25245, frame 780	United States Department of the Treasury	GM Global Technology Operations, Inc.	Release of Security Interest
Nov 5, 2010 Reel 25315, frame 1	Uaw Retiree Medical Benefits Trust	GM Global Technology Operations, Inc.	Release of Security Interest
Nov 8, 2010 Reel 25324, frame 475	GM Global Technology Operations, Inc.	Wilmington Trust Company	Security Agreement
Feb 10, 2011 Reel 25781, frame 211	GM Global Technology Operations, Inc.	GM Global Technology Operations LLC	Change of Name
Nov 7, 2014 Reel 34384, frame 758	Wilmington Trust Company	GM Global Technology Operations 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 1323 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Citations

131

later US patents cite this one

That is top 5% of utility patents granted in 2014 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.

Vehicle Clear Path Detection