Also listed on Dirtt Environmental Solutions, Ltd., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Mar 8, 2027 · High confidence
20-year base term ended Aug 16, 2025
Held by Armstrong World Industries, Inc.
Filed Aug 16, 2005 as application 11/204,421 · Granted Jun 10, 2014
Base term plus 569 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Aug 16, 2005
Aug 16, 2005
Term ends
Mar 8, 2027
Mar 8, 2027
Granted
Jun 10, 2014
Jun 10, 2014
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
569
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.
4
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 569 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 Aug 16, 2005, when this application, 11/204,421, was filed | Aug 16, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +569 days, USPTO patent term adjustment record | Mar 8, 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 | Mar 8, 2027 | High confidence |
This family
| US 8,751,950 | this patent Mar 2027 | Mar 2027 |
| US 8,762,877 | Term ended Aug 2025 | Aug 2025 |
| US 9,536,340 | In force Feb 2027 | Feb 2027 |
3 of 4 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 |
|---|---|---|---|
| Oct 12, 2005 Reel 16877, frame 971 | Loberg, Barrie | Dirrt Environmental Solutions, Ltd. | Assignment of Assignor's Interest |
| Feb 28, 2007 Reel 18941, frame 753 | Loberg, Barrie Arnold | Dirtt Environmental Solutions Ltd. | Corrective Assignment to Correct the Corrective the <assignee> Name to <dirtt Environmental Solutions, Ltd.> Previously Recorded on Reel 016877 Frame 0971. Assignor(S) Hereby Confirms the <assignee> Originally Recorded as <dirrt Environmental Solutions, Ltd.>. |
| Mar 14, 2007 Reel 19012, frame 1 | Dirtt Environment Solutions Ltd. | Ice Edge Business Solutions Ltd. | Assignment of Assignor's Interest |
| Dec 11, 2012 Reel 29443, frame 70 | Ice Edge Business Solutions Ltd. | Comerica Bank, a Texas Banking Association and Authorized Foreign Bank Under the Bank Act (Canada) | Security Agreement |
| May 6, 2019 Reel 49095, frame 64 | Ice Edge Business Solutions, Ltd. | Dirtt Environmental Solutions, Ltd. | Nunc Pro Tunc Assignment |
| Jul 15, 2019 Reel 49758, frame 798 | Comerica Bank | Dirtt Environmental Solutions Ltd.; Ice Edge Business Solutions Ltd. | Release of Security Interest |
| Jul 15, 2019 reel/frame not recorded | Comerica Bank | Dirtt Environmental Solutions Ltd. | Release of Security Interest |
| Jul 15, 2019 reel/frame not recorded | Comerica Bank | Ice Edge Business Solutions Ltd. | Release of Security Interest |
| Jul 24, 2019 Reel 49855, frame 258 | Dirtt Environmental Solutions Ltd. | Royal Bank of Canada | Security Interest |
| Jun 20, 2023 Reel 64040, frame 503 | Dirtt Environmental Solutions Ltd. | Armstrong World Industries, Inc. | Partial Assignment |
| Jun 22, 2023 Reel 64065, frame 257 | Firtst American Commercial Bancorp, Inc. | Armstrong Word Industries, Inc.; Dirtt Environmental Solutions Ltd. | Disclaimer of Interest |
| Jun 22, 2023 Reel 64065, frame 271 | Upper Canada Forest Products Ltd. | Armstrong World Industries, Inc.; Dirtt Environmental Solutions Ltd. | No Interest Letter |
| Jun 22, 2023 Reel 64065, frame 386 | Royal Bank of Canada | Armstrong World Industries, Inc.; Dirtt Environmental Solutions Ltd. | Letter of Consent to Assignment |
| Jun 22, 2023 reel/frame not recorded | Firtst American Commercial Bancorp, Inc. | Armstrong Word Industries, Inc. | Disclaimer of Interest |
| Jun 22, 2023 reel/frame not recorded | Firtst American Commercial Bancorp, Inc. | Dirtt Environmental Solutions Ltd. | Disclaimer of Interest |
| Jun 22, 2023 reel/frame not recorded | Upper Canada Forest Products Ltd. | Armstrong World Industries, Inc. | No Interest Letter |
| Jun 22, 2023 reel/frame not recorded | Upper Canada Forest Products Ltd. | Dirtt Environmental Solutions Ltd. | No Interest Letter |
| Jun 22, 2023 reel/frame not recorded | Royal Bank of Canada | Armstrong World Industries, Inc. | Letter of Consent to Assignment |
| Jun 22, 2023 reel/frame not recorded | Royal Bank of Canada | Dirtt Environmental Solutions Ltd. | Letter of Consent to Assignment |
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.
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Alerts on its grants, lapses and transfers.
What's changing
Mar 2027
Term ends Mar 8, 2027. No further fees fall due before then
Note
The 569 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
48
later US patents cite this one
That is top 25% 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.