Collateral for a security interest recorded Jul 21, 2022 (Jefferies Finance LLC).
Term ends Jun 21, 2027 · High confidence
20-year base term ended May 18, 2025
Held by Natus Medical Incorporated
Filed May 18, 2005 as application 11/131,284 · Granted Aug 18, 2009
Base term plus 764 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
May 18, 2005
May 18, 2005
Term ends
Jun 21, 2027
Jun 21, 2027
Granted
Aug 18, 2009
Aug 18, 2009
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
764
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.
7
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 764 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 May 18, 2005, when this application, 11/131,284, was filed | May 18, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +764 days, USPTO patent term adjustment record | Jun 21, 2027 | 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 | Jun 21, 2027 | High confidence |
This family
| US 7,575,005 | this patent Jun 2027 | Jun 2027 |
| Application 11/435,938 | Abandoned not computed | not computed |
| US 8,244,340 | In force Dec 2030 | Dec 2030 |
| Application 11/740,717 | Abandoned not computed | not computed |
| Application 12/272,051 | Abandoned not computed | not computed |
| US 9,095,268 | In force Jan 2028 | Jan 2028 |
6 of 7 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 |
|---|---|---|---|
| Jul 7, 2005 Reel 16755, frame 433 | Mumford, John Robert; Kurtz, Ronald Leon; Wu, Jianping | Excel-Tech Ltd. | Assignment of Assignor's Interest |
| Jun 2, 2010 Reel 24474, frame 357 | Excel-Tech Ltd. | Natus Medical Incorporated | Assignment of Assignor's Interest |
| Sep 26, 2016 Reel 40146, frame 145 | Natus Medical Incorporated | JPMorgan Chase Bank, N.A., as Administrative Agent | Security Interest |
| Jul 21, 2022 Reel 60799, frame 430 | Natus Medical Incorporated | Jefferies Finance LLC | Security Interest |
| Jul 22, 2022 Reel 60818, frame 680 | JPMorgan Chase Bank, N.A., as Administrative Agent | Natus Medical Incorporated | Release of Security Interest |
| Jul 29, 2022 Reel 61067, frame 493 | Jpmorgan Chase Bank, N.a. | Natus Medical Incorporated | Release of Security Interest in Patents at Reel 040146/FRAME 0145 |
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
Jun 2027
Term ends Jun 21, 2027. No further fees fall due before then
Note
The 764 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
246
later US patents cite this one
That is top 5% of utility patents granted in 2009 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.