Multi-Bowl Wellhead Assembly and Method of Completing a Well

US RE50,847 In force

Term ends Jul 18, 2034 · Low confidence

Computed 20-year base term

Reissue of US 9,534,465, which was surrendered when this reissue was granted; its term and maintenance fees continue here.

Held by Vault Pressure Control LLC

Filed Jan 3, 2019 as application 16/238,842 · Granted Mar 31, 2026

Base term plus 280 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Term ends Jul 18, 2034

2013 2034

Clock starts
Oct 11, 2013

Term ends
Jul 18, 2034

Granted
Mar 31, 2026

base term patent term adjustment 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

280

Days of term adjustment

Read from the original patent's USPTO patent term adjustment record, which governs a reissue. Not recalculated here.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 9,534,465, to Jul 18, 2034. The term already ends on or before that date, so the cap shortened nothing.

2 of 3

Maintenance fees paid

Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from the original patent's grant (Jan 3, 2017). 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 Oct 11, 2013, when the earliest non-provisional application in its chain was filed (this one was filed Jan 3, 2019)	Oct 11, 2033	High confidence
Continuity chain	A reissue: its term follows the original patent's, with the original's term adjustment	follows the original patent	Medium confidence
Patent term adjustment	+280 days, the original patent's USPTO patent term adjustment record, which governs a reissue (35 U.S.C. 251). This reissue's own record carries none	Jul 18, 2034	Medium confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 9,534,465)	resolves to Jul 18, 2034, no earlier than this term, so no change	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	2 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	Jul 18, 2034	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.

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

Multi-Bowl Wellhead Assembly and Method of Completing a Well

Term ends Jul 18, 2034 · Low confidence

20-year base term ends Oct 11, 2033

How we calculated this date

Sources