Term ended Aug 16, 2025 · High confidence
20-year base term ended Aug 16, 2025
USPTO later recorded it as expired for non-payment on Jul 27, 2026.
Held by Armstrong World Industries, Inc.
Filed Jun 24, 2009 as application 12/444,890 · Granted Jun 24, 2014
Base term, 20 years from filing
Today
Term ended Aug 16, 2025
2005
2026
Clock starts
Aug 16, 2005
Aug 16, 2005
Term ended
Aug 16, 2025
Aug 16, 2025
Granted
Jun 24, 2014
Jun 24, 2014
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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,510,672, to Aug 16, 2025. The term already ends on or before that date, so the cap shortened nothing.
2 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. 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 is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 application 11/204,421, the earliest non-provisional in its chain, was filed (this one was filed Jun 24, 2009) | Aug 16, 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 | Disclaimer resolved from the filed document (refs US 8,510,672) | resolves to Aug 16, 2025, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Jul 27, 2026, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Aug 16, 2025 | High confidence |
This family
| US 8,751,950 | In force Mar 2027 | Mar 2027 |
| US 8,762,877 | this patent 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 |
|---|---|---|---|
| Jul 15, 2009 Reel 22961, frame 167 | Loberg, Barrie Arnold; Boden, Dale | Dirtt Environmental Solutions Ltd. | Assignment of Assignor's Interest |
| Sep 13, 2010 Reel 24978, frame 24 | Dirtt Environmental 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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,510,672, ends no earlier than this term, so it caps nothing.
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.