Electropneumatic Horn with Air Venting Channels

US 7,938,078 In force

Overview Sources & methods

Term ends Jul 31, 2028 · Medium confidence

Computed 20-year base term

Why Medium: A parent in the chain could not be resolved.

Held by Wolo MFG. Corp.

Filed Mar 26, 2010 as application 12/732,367 · Granted May 10, 2011

Base term, 20 years from filing

Today

20 years from filing

Term ends Jul 31, 2028

2008 2028

Clock starts
Jul 31, 2008

Term ends
Jul 31, 2028

Granted
May 10, 2011

base term 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

None

Term adjustment

No prosecution delay on this record.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 7,712,430, to Jul 31, 2028. The term already ends on or before that date, so the cap shortened nothing.

3 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 Jul 31, 2008, when the earliest non-provisional application in its chain was filed (this one was filed Mar 26, 2010); a parent in its chain could not be resolved (the next row)	Jul 31, 2028	High confidence
Continuity chain	A parent in the chain could not be resolved	dated from this application's own claim	Medium confidence
Patent term adjustment	None on file	no change	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 7,712,430)	resolves to Jul 31, 2028, no earlier than this term, so no change	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	3 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	Jul 31, 2028	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.

In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.

Electropneumatic Horn with Air Venting Channels

Term ends Jul 31, 2028 · Medium confidence

20-year base term ends Jul 31, 2028

How we calculated this date

Sources