Lapsed Nov 2, 2022 on the fee record · High confidence
20-year base term ended Dec 5, 2025
Third maintenance fee unpaid; grace period ended.
Held by Memjet Technology Limited
Filed Oct 6, 2008 as application 12/246,493 · Granted Nov 2, 2010
Base term, 20 years from filing
Today
Lapsed Nov 2, 2022
2005
2026
Clock starts
Dec 5, 2005
Dec 5, 2005
No longer in force
Nov 2, 2022
Nov 2, 2022
Granted
Nov 2, 2010
Nov 2, 2010
Term would have run to
Dec 5, 2025
Dec 5, 2025
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
4
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 5, 2025: its 20-year base term, with no 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 Dec 5, 2005, when application 11/293,840, the earliest non-provisional in its chain, was filed (this one was filed Oct 6, 2008) | Dec 5, 2025 | 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 | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Nov 2, 2022 | High confidence |
| Computed term end | The steps above, in order | Nov 2, 2022 | High confidence |
This family
| US 7,452,055 | In force no later than Jan 2027 | no later than Jan 2027 |
| US 7,775,643 | Term ended May 2026 | May 2026 |
| US 7,780,262 | Lapsed on the fee record Aug 2018 | Aug 2018 |
| US 7,824,026 | this patent Nov 2022 | Nov 2022 |
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 6, 2008 Reel 21639, frame 792 | Hibbard, Christopher; Silverbrook, Kia; Nakazawa, Akira; Jackson, Garry Raymond; Morgan, John Douglas Peter | Silverbrook Research Pty Ltd. | Assignment of Assignor's Interest |
| Jul 9, 2012 Reel 28516, frame 458 | 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.
Citations
2
later US patents cite this one
That is below the median 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
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.