Up and Down Conversion Systems for Production of Emitted Light from Various Energy Sources Including Radio Frequency, Microwave Energy and Magnetic Induction Sources for Upconversion

US 10,080,275 Lapsed on the fee record

Overview Sources & methods

Lapsed Sep 18, 2026 on the fee record · Medium confidence

Computed 20-year base term

Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.

Second maintenance fee unpaid; grace period ended.

Held by Duke University

Filed Apr 16, 2015 as application 14/688,687 · Granted Sep 18, 2018

Base term, 20 years from filing, plus 397 days of patent term adjustment (USPTO delay)

Today

Lapsed Sep 18, 2026

2010 2031

Clock starts
Nov 10, 2010

No longer in force
Sep 18, 2026

Granted
Sep 18, 2018

Term would have run to
Dec 12, 2031

base term patent term adjustment after the term ends fee events Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

397

Days of term adjustment

Read from the USPTO patent term adjustment record, not recalculated here.

Unresolved

Terminal disclaimer

On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.

1 of 3

Maintenance fees paid

Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.

Step	Input	Date after this step	Confidence
Base term, 20 years from filing	Clock starts Nov 10, 2010, when the earliest non-provisional application in its chain was filed (this one was filed Apr 16, 2015)	Nov 10, 2030	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+397 days, USPTO patent term adjustment record	Dec 12, 2031	High confidence
Terminal disclaimer cap	Disclaimer on file (approved), reference document not resolved	no cap applied, and none guessed	Medium confidence
Patent term extension	None on file	no change	High confidence
Fee events	1 of 3 maintenance fees paid	lapsed Sep 18, 2026	High confidence
Computed term end	The steps above, in order	Sep 18, 2026	Medium confidence

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.

Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built

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

Up and Down Conversion Systems for Production of Emitted Light from Various Energy Sources Including Radio Frequency, Microwave Energy and Magnetic Induction Sources for Upconversion

Lapsed Sep 18, 2026 on the fee record · Medium confidence

20-year base term ends Nov 10, 2030

How we calculated this date

Sources