Lewmar Limited

8 patents currently held · Updated Nov 15, 2026

1 more in force is now held by another company

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

Ending by 2030

Nov 2032

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 Dec 23, 2026
The maintenance fee for Winch (US 9,061,870) comes due Dec 23, 2026. Unpaid by Jun 23, 2027, it lapses early.
1 fee due Apr 22, 2027
The maintenance fee for Gypsy for windlass and method for its manufacture (US 10,450,173) comes due Apr 22, 2027. Unpaid by Oct 22, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 term has ended 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 8,820,720	Winch In force Term ends Nov 2, 2032 · From the USPTO record	In force	Term ends Nov 2, 2032	From the USPTO record
US 9,061,870	Winch In force Term ends Dec 30, 2032 · From the USPTO record	In force	Term ends Dec 30, 2032	From the USPTO record
US 10,450,173	Gypsy for windlass and method for its manufacture In force Term ends Jul 5, 2036 · From the USPTO record	In force	Term ends Jul 5, 2036	From the USPTO record
US 10,005,532	Retractable thruster In force Term ends Nov 9, 2036 · From the USPTO record	In force	Term ends Nov 9, 2036	From the USPTO record
US 10,137,967	Windlass assembly In force Term ends Dec 31, 2036 · From the USPTO record	In force	Term ends Dec 31, 2036	From the USPTO record
US 10,975,892	Hydraulic reservoir with a vortex for deaeration of the hydraulic oil In force Term ends May 7, 2038 · From the USPTO record	In force	Term ends May 7, 2038	From the USPTO record
US 10,894,580	Sliding roof panel assembly and method for its operation In force Term ends Apr 17, 2039 · From the USPTO record	In force	Term ends Apr 17, 2039	From the USPTO record
US 10,766,586	Retractable thruster and drive shaft for retractable thruster In force Term ends May 14, 2039 · From the USPTO record	In force	Term ends May 14, 2039	From the USPTO record

Also on record, not counted in the 8: 1 patent in force now held by others · 10 lapsed for an unpaid fee · 12 ended at full term. 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.

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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.

3 no status recorded

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