Electromechanically Operated Valve

US 4,053,137 Term ended

Overview Sources & methods

Term ended no later than Oct 11, 1997 · Low confidence

Held by Aerocontrolex Group, Inc.

Application 05/649,657 · Granted Oct 11, 1977

None

Term adjustment

No prosecution delay on this record.

None

Terminal disclaimer

No disclaimer on this record.

Did not apply

Maintenance fees

Maintenance fees apply only to applications filed on or after Dec 12, 1980 (35 U.S.C. 41(b)).

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
Grant date	As the patent's record gives it	Oct 11, 1977	High confidence
Statutory bound, 35 U.S.C. 154	A patent term runs 17 years from grant or 20 years from filing, and either ends no later than 20 years from grant. The record gives no filing date to compute the exact term end from, so the date is a bound	no later than Oct 11, 1997	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.