Risi Stone Inc.

8 patents currently held · Updated Nov 15, 2026

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

Ending by 2030

Oct 2033

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

1 fee due Mar 29, 2027
The maintenance fee for Prefabricated pillar slab system (US 9,145,683) comes due Mar 29, 2027. Unpaid by Sep 29, 2027, it lapses early.

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Recent changes

1 of the patents on this record was granted since Aug 17, 2026

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Showing 1 to 8 of 8

Patent	Title	Status	Expires	Confidence
US 9,145,683	Prefabricated pillar slab system In force Term ends Oct 11, 2033 · From the USPTO record	In force	Term ends Oct 11, 2033	From the USPTO record
US 10,760,267	Method and mold for manufacturing an interlocking concrete retaining wall block In force Ends no later than May 5, 2035 · From the USPTO record	In force	Ends no later than May 5, 2035	From the USPTO record
US 9,649,778	Method and mold for manufacturing an interlocking concrete block In force Term ends Sep 13, 2035 · From the USPTO record	In force	Term ends Sep 13, 2035	From the USPTO record
US 9,945,118	Method and mold for manufacturing an interlocking concrete retaining wall block In force Term ends Apr 19, 2036 · From the USPTO record	In force	Term ends Apr 19, 2036	From the USPTO record
US 10,280,584	Reversible segmental retaining wall block, molds and methods for manufacturing same, and methods of forming retaining walls with same In force Term ends Apr 17, 2038 · From the USPTO record	In force	Term ends Apr 17, 2038	From the USPTO record
US 11,401,679	Combination standard and corner segmental retaining wall block with integral vertical interlock system In force Term ends Oct 2, 2040 · From the USPTO record	In force	Term ends Oct 2, 2040	From the USPTO record
US 11,739,493	Segmental Retaining Wall Block with Integral Vertical Interlock System In force Term ends Nov 23, 2041 · High confidence	In force	Term ends Nov 23, 2041	High confidence
US 12,723,356	Stackable Interlocking Structural Foam Blocks for Supporting Patios and Other Hardscape Block Systems In force Term ends Feb 14, 2045 · High confidence	In force	Term ends Feb 14, 2045	High confidence

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

2 pending · 1 no status recorded

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