Perftech, Inc.

52 patents currently held · Updated Nov 14, 2026

1 more in force is now held by another company

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

Ending by 2030

Dec 2027

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

1 fee due Dec 18, 2026
The maintenance fee for System and method for set-top-box messaging display (US 10,327,038) comes due Dec 18, 2026. Unpaid by Jun 21, 2027, it lapses early.
2 fees due Jan 9 to 25, 2027 · next Jan 9
1 fee due Jul 5, 2027
The maintenance fee for System, method and computer readable medium for message authentication to subscribers of an internet service provider (US 9,231,961) comes due Jul 5, 2027. Unpaid by Jan 5, 2028, it lapses early.
1 fee due Aug 18, 2027
The maintenance fee for Method and system for providing watermark to subscribers (US 10,567,470) comes due Aug 18, 2027. Unpaid by Feb 18, 2028, it lapses early.
1 fee due Sep 24, 2027
The maintenance fee for System, method and computer readable medium for determining users of an internet service (US 10,601,841) comes due Sep 24, 2027. Unpaid by Mar 24, 2028, it lapses early.
2 fees due Oct 7 to 21, 2027 · next Oct 7

Which patents, and when each one lapses · Pro

Recent changes

1 of the patents on this record was granted since Aug 16, 2026

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Patent	Title	Status	Expires	Confidence
US 8,533,476	System, method and computer readable medium for message authentication to subscribers of an internet service provider In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 8,996,640	System, Method and Computer Readable Medium for Processing Unsolicited Electronic Mail In force Ends no later than Dec 24, 2027 · Low confidence	In force	Ends no later than Dec 24, 2027	Low confidence
US 9,300,613	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 9,742,786	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 10,069,846	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 10,554,671	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 10,986,102	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 10,992,686	System, method and computer readable medium for determining users of an internet service In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 11,552,961	System, method and computer readable medium for processing unsolicited electronic mail In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record
US 11,956,251	System, method and computer readable medium for determining users of an internet service In force Ends no later than Dec 24, 2027 · From the USPTO record	In force	Ends no later than Dec 24, 2027	From the USPTO record

10 of 52 patents shown.

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Pro members: see all 52 patents

Also on record, not counted in the 52: 1 patent in force now held by others · 2 lapsed for an unpaid fee · 12 ended at full term. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

5 pending · 4 no status recorded

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