Term ends Apr 18, 2027 · High confidence
20-year base term ended May 27, 2024
Held by Memjet Technology Limited
Filed May 27, 2004 as application 10/854,516 · Granted Jun 23, 2009
Base term plus 1056 days of patent term adjustment (USPTO delay)
Today
2004
2027
Clock starts
May 27, 2004
May 27, 2004
Term ends
Apr 18, 2027
Apr 18, 2027
Granted
Jun 23, 2009
Jun 23, 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
1,056
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 10,854,516, to Apr 18, 2027. The term already ends on or before that date, so the cap shortened nothing.
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.
1,425
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 1056 days past its 20-year base term on prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 27, 2004, when this application, 10/854,516, was filed | May 27, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1056 days, USPTO patent term adjustment record | Apr 18, 2027 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,854,516) | resolves to Apr 18, 2027, no earlier than this term, so no change | 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 | Apr 18, 2027 | High confidence |
This family
| US 6,464,340 | Term ended Aug 2018 | Aug 2018 |
| US 6,918,655 | Lapsed on the fee record Jul 2017 | Jul 2017 |
| US 6,938,989 | Lapsed on the fee record Sep 2013 | Sep 2013 |
| US 6,742,873 | Lapsed on the fee record Jun 2016 | Jun 2016 |
| US 6,923,526 | Lapsed on the fee record Aug 2017 | Aug 2017 |
| US 6,588,882 | Lapsed on the fee record Jul 2015 | Jul 2015 |
| US 6,505,912 | Term ended no later than Jul 2018 | no later than Jul 2018 |
| US 6,485,123 | Lapsed on the fee record Nov 2014 | Nov 2014 |
8 of 1425 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 |
|---|---|---|---|
| May 27, 2004 Reel 15388, frame 174 | Walmsley, Simon Robert; Jackson Pulver, Mark; Plunket, Richard Thomas; Sheahan, John Robert; Silverbrook, Kia; Webb, Michael John | Silverbrook Research Pty. Ltd. | Assignment of Assignor's Interest |
| Jul 17, 2012 Reel 28570, frame 390 | Silverbrook Research Pty. Limited and Clamate Pty Limited | Zamtec Limited | Assignment of Assignor's Interest |
| Jun 25, 2014 Reel 33244, frame 276 | Zamtec Limited | Memjet Technology Limited | Change of Name |
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
Apr 2027
Term ends Apr 18, 2027. No further fees fall due before then
Note
The 1056 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 10,854,516, ends no earlier than this term, so it caps nothing.
Citations
20
later US patents cite this one
That is above the median 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.