Methods for Heating with Lamps

US 8,859,042 Lapsed on the fee record

Overview Sources & methods

Lapsed Oct 14, 2026 on the fee record · Low confidence

Computed 20-year base term

Third maintenance fee unpaid; grace period ended. The USPTO has not yet posted the lapse.

Held by Alta Devices, Inc.

Filed Mar 16, 2010 as application 12/725,318 · Granted Oct 14, 2014

Base term, 20 years from filing, plus 428 days of patent term adjustment (USPTO delay)

Today

Lapsed Oct 14, 2026

2009 2030

Clock starts
May 29, 2009

No longer in force
Oct 14, 2026

Granted
Oct 14, 2014

Term would have run to
Jul 31, 2030

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

428

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.

2 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 May 29, 2009, when the earliest non-provisional application in its chain was filed (this one was filed Mar 16, 2010)	May 29, 2029	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+428 days, USPTO patent term adjustment record	Jul 31, 2030	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	No fee event states this; the fee state is read from the payments the fee record holds; the fee record shows no payment for this window, and USPTO's status still reads "Patented Case"	lapsed Oct 14, 2026	Low confidence
Computed term end	The steps above, in order	Oct 14, 2026	Low 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.

Methods for Heating with Lamps

Lapsed Oct 14, 2026 on the fee record · Low confidence

20-year base term ends May 29, 2029

How we calculated this date

Sources