Also listed on Contech Bridge Solutions 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 Jul 17, 2027 · High confidence
20-year base term ended Sep 9, 2025
Held by Contech Engineered Solutions LLC
Filed Sep 9, 2005 as application 11/223,566 · Granted Jul 7, 2009
Base term plus 676 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Sep 9, 2005
Sep 9, 2005
Term ends
Jul 17, 2027
Jul 17, 2027
Granted
Jul 7, 2009
Jul 7, 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
676
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.
This patent's term runs 676 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 Sep 9, 2005, when this application, 11/223,566, was filed | Sep 9, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +676 days, USPTO patent term adjustment record | Jul 17, 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 | Jul 17, 2027 | High confidence |
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 |
|---|---|---|---|
| Sep 9, 2005 Reel 16988, frame 426 | Beach, Timothy J.; Handorf, Jeffrey Von | Contech Arch Technologies, Inc. | Assignment of Assignor's Interest |
| Mar 8, 2006 Reel 17275, frame 45 | Keystone Retaining Wall Systems, Inc.; Armortec, Inc.; Contech Arch Technologies, Inc.; Contech Technologies, Inc.; Petratech, Inc.; Stormwater Management, Inc.; Vortechnics, Inc. | Wachovia Bank, National Association, as Administrative Agent | Security Agreement |
| Apr 13, 2006 Reel 17458, frame 892 | Contech Arch Technologies, Inc. | Wachovia Bank, National Association | Certificate of Amendment of Certificate of Incorporation |
| Jan 15, 2009 Reel 22113, frame 429 | Contech Arch Technologies, Inc. | Contech Bridge Solutions Inc. | Change of Name |
| Sep 22, 2010 Reel 25026, frame 472 | Contech Construction Products, Inc.; Contech Bridge Solutions Inc.; CDS Technologies, Inc.; Contech Earch Stabilization Solutions Inc.; Contech Technologies, LLC; Contech Trucking & Logistics, LLC; Safety Precast, Inc.; Superior Drainage, LLC; West Texas Culverts, Inc.; Thompson Culvert Company; Armortec, LLC; Keystone Retaining Wall Systems, Inc.; Alliance Construction Products Inc.; Contech Stormwater Solutions Inc. | Wells Fargo Bank, N.a. | Security Agreement |
| Feb 3, 2012 Reel 27650, frame 107 | Contech Bridge Solutions Inc. | Contech Bridge Solutions LLC | Certificate of Conversion |
| Feb 21, 2012 Reel 28014, frame 952 | Contech Engineered Solutions LLC; Contech Bridge Solutions LLC; Contech Stormwater Solutions LLC; Keystone Retaining Wall Systems LLC; CDS Technologies LLC; Contech Earth Stabilization Solutions LLC | Wells Fargo Capital Finance, LLC | Security Interest |
| Aug 7, 2012 Reel 28735, frame 798 | Contech Bridge Solutions LLC | Contech Engineered Solutions LLC | Merger |
| 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 |
| Aug 7, 2013 Reel 30964, frame 588 | Wells Fargo Bank, National Association | Contech Engineered Solutions LLC (F/K/A Contech Construction Products Inc.); Keystone Retaining Wall Systems LLC (F/K/A Keystone Retaining Wall Systems Inc.); Contech Trucking & Logistics, LLC | Release of Security Interest |
| Aug 7, 2013 reel/frame not recorded | Wells Fargo Bank, National Association | Contech Engineered Solutions LLC (F/K/A Contech Construction Products Inc.) | Release of Security Interest |
| Aug 7, 2013 reel/frame not recorded | Wells Fargo Bank, National Association | Keystone Retaining Wall Systems LLC (F/K/A Keystone Retaining Wall Systems Inc.) | Release of Security Interest |
| Aug 7, 2013 reel/frame not recorded | Wells Fargo Bank, National Association | Contech Trucking & Logistics, LLC | Release of Security Interest |
| 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 2, 2016 Reel 40797, frame 562 | Wells Fargo Capital Finance, LLC | Contech Bridge 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
Jul 2027
Term ends Jul 17, 2027. No further fees fall due before then
Note
The 676 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
15
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.