Also listed on Contech Construction Products Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Dec 8, 2016 (Wells Fargo Bank, National Association).
Term ends Jan 30, 2027 · High confidence
20-year base term ends May 29, 2029
Held by Contech Engineered Solutions LLC
Filed Feb 6, 2012 as application 13/367,173 · Granted Mar 25, 2014
Base term plus 64 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2009
2029
Clock starts
May 29, 2009
May 29, 2009
Term ends
Jan 30, 2027
Jan 30, 2027
Granted
Mar 25, 2014
Mar 25, 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
64
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,109,450.
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 64 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 29, 2009, when application 12/474,902, the earliest non-provisional in its chain, was filed (this one was filed Feb 6, 2012) | May 29, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +64 days, USPTO patent term adjustment record | Aug 1, 2029 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,109,450) | capped to Jan 30, 2027 | 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 | Jan 30, 2027 | High confidence |
This family
| Application 61/057,567 | Provisional application no patent term | no patent term |
| US 8,109,540 | In force Jun 2030 | Jun 2030 |
| Application PCT/US2009/045562 | PCT application no patent term | no patent term |
| US 8,678,449 | this patent Jan 2027 | Jan 2027 |
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 |
|---|---|---|---|
| Jun 18, 2013 Reel 30634, frame 40 | Keystone Retaining Wall Systems LLC; Contech Engineered Solutions LLC; Imbrium Systems LLC | Goldman Sachs Lending Partners LLC | Notice of Grant of Security Interest in Patents |
| Jan 24, 2014 Reel 32040, frame 838 | Zepp, William; Schluter, James C.; Shade, James C. | Contech Construction Products Inc. | Assignment of Assignor's Interest |
| Jan 24, 2014 Reel 32125, frame 871 | Contech Construction Products Inc. | Contech Engineered Solutions LLC | Conversion |
| Nov 30, 2016 Reel 40741, frame 458 | Goldman Sachs Lending Partners, LLC | Contech Technologies, Inc. | Release of Security Interest |
| Dec 2, 2016 Reel 40796, frame 939 | Goldman Sachs Lending Partners, LLC | Contech Engineered Solutions, LLC | Release of Security Interest |
| Dec 8, 2016 Reel 40852, frame 262 | Contech Engineered Solutions Inc. | Wells Fargo Bank, National Association, as Agent | Security Interest |
| Feb 10, 2025 Reel 70170, frame 919 | Best Block, LLC; Contech Engineered Solutions LLC; Custom Building Products, LLC; Forterra Concrete Products, LLC; Forterra Pipe & Precast, LLC; Keystone Retaining Wall Systems LLC; Pavestone, LLC; The Quikrete Companies, LLC; United States Pipe and Foundry Company, LLC; Usp Holdings, LLC | U.S. Bank Trust Company, National Association | Patent Security Agreement |
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.
What's changing
Jan 2027
Term ends Jan 30, 2027. No further fees fall due before then
Note
The 64 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,109,450.
Citations
1
later US patent cites this one
That is below the median 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.