Lubrication system for the piston ring and cylinder liner of an internal combustion engine

US 9,482,123 In force, term unresolved

Term ends no later than Feb 7, 2033 · Medium confidence

Computed 20-year base term

In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.

Held by General Atomics Aeronautical Systems, Inc.

Filed Aug 27, 2009 as application 12/583,916 · Granted Nov 1, 2016

Base term plus 1260 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Ends no later than Feb 7, 2033

2009 2033

Clock starts
Aug 27, 2009

Ends no later than
Feb 7, 2033

Granted
Nov 1, 2016

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

1,260

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 Aug 27, 2009, when this application, 12/583,916, was filed	Aug 27, 2029	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+1260 days, USPTO patent term adjustment record	Feb 7, 2033	High confidence
Terminal disclaimer cap	Disclaimer on file (filed), reference document not resolved	no cap applied, and none guessed	Medium 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	no later than Feb 7, 2033	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

This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.

Lubrication system for the piston ring and cylinder liner of an internal combustion engine

Term ends no later than Feb 7, 2033 · Medium confidence

20-year base term ends Aug 27, 2029

How we calculated this date

Sources