Busek Co., Inc.

12 patents currently held · Updated Nov 14, 2026

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

Ending by 2030

Feb 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 Nov 10, 2027
The maintenance fee for Hall thruster for use with a condensable propellant (US 9,334,855) comes due Nov 10, 2027. Unpaid by May 10, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 term has ended since Aug 16, 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.

Patent	Title	Status	Expires	Confidence
US 7,459,858	Hall Thruster with Shared Magnetic Structure In force Term ends Feb 6, 2027 · High confidence	In force	Term ends Feb 6, 2027	High confidence
US 7,420,182	Combined Radio Frequency and Hall Effect Ion Source and Plasma Accelerator System In force Term ends May 9, 2027 · High confidence	In force	Term ends May 9, 2027	High confidence
US 8,197,578	Liquid Degasser for a Space Device In force Term ends Jun 3, 2028 · High confidence	In force	Term ends Jun 3, 2028	High confidence
US 7,932,492	Electrospray Device In force Term ends Oct 26, 2029 · High confidence	In force	Term ends Oct 26, 2029	High confidence
US 8,550,405	Solar Powered Spacecraft Power System for a Hall Effect Thruster In force Term ends Feb 19, 2031 · High confidence	In force	Term ends Feb 19, 2031	High confidence
US 8,448,419	Electrospray source In force Term ends May 9, 2031 · High confidence	In force	Term ends May 9, 2031	High confidence
US 8,610,356	Iodine Fueled Plasma Generator System In force Term ends Aug 15, 2032 · High confidence	In force	Term ends Aug 15, 2032	High confidence
US 8,907,578	Autonomous Method and System for Minimizing the Magnitude of Plasma Discharge Current Oscillations in a Hall Effect Plasma Device In force Term ends Jun 25, 2033 · High confidence	In force	Term ends Jun 25, 2033	High confidence
US 9,334,855	Hall thruster for use with a condensable propellant In force Term ends Mar 8, 2035 · High confidence	In force	Term ends Mar 8, 2035	High confidence
US 9,493,252	Long Life Thruster In force Term ends Jul 27, 2035 · High confidence	In force	Term ends Jul 27, 2035	High confidence

10 of 12 patents shown.

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Pro members: see all 12 patents

Also on record, not counted in the 12: 2 lapsed for an unpaid fee · 4 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.

8 abandoned · 1 no status recorded

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