Mac & Mac Hydrodemolition Inc.

20 patents currently held · Updated Nov 15, 2026

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

Recorded under 3 name spellings.

Ending by 2030

Oct 2027

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 May 19, 2027
The maintenance fee for Method and apparatus for high pressure water treatment of the inside of a pipe section (US 10,478,870) comes due May 19, 2027. Unpaid by Nov 19, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

Nothing was recorded against this company's patents in the last 90 days.

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.

Patent	Title	Status	Expires	Confidence
US 8,191,972	Hydrodemolition Machine for Inclined Surfaces In force Term ends Oct 1, 2027 · High confidence	In force	Term ends Oct 1, 2027	High confidence
US 8,298,347	Method and apparatus for cleaning a substantially vertical surface In force Term ends Oct 2, 2029 · From the USPTO record	In force	Term ends Oct 2, 2029	From the USPTO record
US 8,394,205	Pipe scarifying system and method In force Term ends Jan 12, 2031 · From the USPTO record	In force	Term ends Jan 12, 2031	From the USPTO record
US 8,827,373	Top-down hydro-demolition system with rigid support frame In force Term ends Nov 13, 2031 · From the USPTO record	In force	Term ends Nov 13, 2031	From the USPTO record
US 8,794,712	Refractory material removal system and method In force Term ends Feb 2, 2032 · From the USPTO record	In force	Term ends Feb 2, 2032	From the USPTO record
US 8,851,576	Hydro-demolition facet cutter and method of use In force Term ends Oct 29, 2032 · From the USPTO record	In force	Term ends Oct 29, 2032	From the USPTO record
US 9,566,621	Method and apparatus for high pressure water treatment of the inside of a pipe section In force Term ends Jul 9, 2035 · From the USPTO record	In force	Term ends Jul 9, 2035	From the USPTO record
US 10,478,870	Method and apparatus for high pressure water treatment of the inside of a pipe section In force Ends no later than Jul 9, 2035 · From the USPTO record	In force	Ends no later than Jul 9, 2035	From the USPTO record
US 9,476,170	Shielding system for hydrodemolition apparatus In force Term ends Oct 15, 2035 · From the USPTO record	In force	Term ends Oct 15, 2035	From the USPTO record
US 9,751,116	Pipe material removal apparatus and method In force Term ends Oct 28, 2035 · From the USPTO record	In force	Term ends Oct 28, 2035	From the USPTO record

10 of 20 patents shown.

Pro members see all 20.

Pro members: see all 20 patents

Also on record, not counted in the 20: 12 ended at full term · 1 surrendered on reissue. List them

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.

Export every term end as CSV · Pro

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.

3 no status recorded

List them