Doble Engineering Company

20 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

Feb 2030

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 Jan 28, 2027
The maintenance fee for System and Method for Testing Electrical Equipment Used In A Power System (US 9,091,731) comes due Jan 28, 2027. Unpaid by Jul 28, 2027, it lapses early.
2 fees due Jul 28 to 30, 2027 · next Jul 28
2 fees due Oct 12 to 14, 2027 · next Oct 12

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 9,091,731	System and Method for Testing Electrical Equipment Used In A Power System In force Term ends Feb 20, 2030 · High confidence	In force	Term ends Feb 20, 2030	High confidence
US 8,792,542	Method and Device for Improved Detection and Analysis of Partial Discharge Activity in and Around High Voltage Electrical Equipment In force Term ends Jan 27, 2031 · High confidence	In force	Term ends Jan 27, 2031	High confidence
US 8,217,677	System and Method for Modulating a Power Supply in a Relay Test System In force Term ends May 11, 2031 · High confidence	In force	Term ends May 11, 2031	High confidence
US 9,632,128	Method and Apparatus for Testing Utility Power Devices In force Term ends Nov 4, 2033 · High confidence	In force	Term ends Nov 4, 2033	High confidence
US 9,874,613	Method and System of Apparatuses for Testing Utility Power Devices In force Term ends Nov 4, 2033 · High confidence	In force	Term ends Nov 4, 2033	High confidence
US 9,313,878	Methods and Circuit Structures for Mitigating Voltage Stresses on Printed Circuit Board (PCB) in High Voltage Devices In force Term ends Jun 13, 2034 · High confidence	In force	Term ends Jun 13, 2034	High confidence
US 9,482,712	Method and Apparatus for Testing Utility Power Devices In force Term ends Dec 19, 2034 · High confidence	In force	Term ends Dec 19, 2034	High confidence
US 9,551,752	Dual ground breaker testing system In force Term ends Feb 2, 2035 · From the USPTO record	In force	Term ends Feb 2, 2035	From the USPTO record
US 9,671,451	System and Method for Performing Transformer Diagnostics In force Term ends Sep 2, 2035 · High confidence	In force	Term ends Sep 2, 2035	High confidence
US 10,203,364	System and Method for Performing Transformer Diagnostics In force Term ends Feb 17, 2037 · High confidence	In force	Term ends Feb 17, 2037	High confidence

10 of 20 patents shown.

Pro members see all 20.

Pro members: see all 20 patents

Also on record, not counted in the 20: 1 lapsed for an unpaid fee · 14 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

Every application published under this name has become a patent.