Who owns the SI trademark?

The SI trademark is owned by Siliconix Incorporated.

What class is the SI trademark registered in?

The SI trademark is registered in Class 009 (Electronics, software & scientific instruments).

What is the serial number for SI?

The USPTO serial number for SI is 78623276.

What is the registration number for SI?

SI is registered under USPTO registration number 3087499.

SI - Owned by Siliconix Incorporated - (Class 009)

What to file next

Section 9 renewal, filed with a Section 8 declaration

When: Due between the ninth and tenth anniversary of registration, then before each tenth anniversary after that.
Extensions and grace: A six-month grace period follows, with an added per-class fee.
If it is missed: A missed renewal cancels the registration, and there is no revival route for it.

How Section 9 renewal works

General information about USPTO practice, not legal advice. The register is the authority, and a filing that has not yet posted can change what is owed.

Full Goods & Services

Class 009Electronics, software & scientific instruments

US codes: 021, 023, 026, 036, 038

First use anywhere: Oct 11, 1962

First use in commerce: Nov 03, 1962

Scientific, research, navigation, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signalling, detecting, testing, inspecting, life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electricity; apparatus and instruments for recording, transmitting, reproducing or processing sound, images or data; recorded and downloadable multimedia files, computer software, blank digital or analogue recording and storage media; mechanisms for coin-operated apparatus; cash registers, calculating devices; computers and computer peripheral devices; diving suits, divers' masks, ear plugs for divers, nose clips for divers, gloves for divers, breathing apparatus for underwater swimming; fire-extinguishing apparatus.

This description is as filed with the USPTO and defines the scope of trademark protection.

Filing Basis & Declarations

Filed as Use ApplicationUse Application CurrentlySection 8 AcceptedSection 15 AcknowledgedTrademark

International Filings

Madrid Protocol1 filings

This mark has 1 Madrid Protocol filing on record with the USPTO.

1265477

480Aug 06, 2015

Source: USPTO Madrid International Filing Requests

Status History

37 events

CASE ASSIGNED TO POST REGISTRATION PARALEGAL

Jul 06, 2026

Code APRE

REGISTERED - SEC. 8 (10-YR) ACCEPTED/SEC. 9 GRANTED

Jul 06, 2026

Code 89AG

REGISTERED AND RENEWED (SECOND RENEWAL - 10 YRS)

Jul 06, 2026

Code RNL2

NOTICE OF ACCEPTANCE OF SEC. 8 & 9 - E-MAILED

Jul 06, 2026

Code NA89

TEAS SECTION 8 & 9 RECEIVED

May 04, 2026

Code E89R

COURTESY REMINDER - SEC. 8 (10-YR)/SEC. 9 E-MAILED

May 02, 2025

Code REM2

TEAS CHANGE OF OWNER ADDRESS RECEIVED

Apr 08, 2022

Code COAR

TEAS REVOKE/APP/CHANGE ADDR OF ATTY/DOM REP RECEIVED

Apr 08, 2022

Code REAP

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Apr 08, 2022

Code ARAA

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Apr 08, 2022

Code TCCA

APPLICANT/CORRESPONDENCE CHANGES (NON-RESPONSIVE) ENTERED

Apr 08, 2022

Code CHAN

TEAS REVOKE/APP/CHANGE ADDR OF ATTY/DOM REP RECEIVED

Dec 11, 2019

Code REAP

ATTORNEY/DOM.REP.REVOKED AND/OR APPOINTED

Dec 11, 2019

Code ARAA

ASSIGNMENT OF OWNERSHIP NOT UPDATED AUTOMATICALLY

Jun 19, 2019

Code ASCK

REGISTERED - SEC. 8 (10-YR) ACCEPTED/SEC. 9 GRANTED

Aug 09, 2017

Code 89AG

REGISTERED AND RENEWED (FIRST RENEWAL - 10 YRS)

Aug 09, 2017

Code RNL1

NOTICE OF ACCEPTANCE OF SEC. 8 & 9 - E-MAILED

Aug 09, 2017

Code NA89

TEAS RESPONSE TO OFFICE ACTION-POST REG RECEIVED

Jan 23, 2017

Code EROP

CASE ASSIGNED TO POST REGISTRATION PARALEGAL

Jul 22, 2016

Code APRE

POST REGISTRATION ACTION MAILED - SEC. 8 & 9

Jul 22, 2016

Code PR89

TEAS SECTION 8 & 9 RECEIVED

May 02, 2016

Code E89R

COURTESY REMINDER - SEC. 8 (10-YR)/SEC. 9 E-MAILED

May 02, 2015

Code REM2

CASE ASSIGNED TO POST REGISTRATION PARALEGAL

Dec 23, 2011

Code APRE

REGISTERED - SEC. 8 (6-YR) ACCEPTED & SEC. 15 ACK.

Dec 23, 2011

Code C15A

NOTICE OF ACCEPTANCE OF SEC. 8 & 15 - E-MAILED

Dec 23, 2011

Code NA85

TEAS SECTION 8 & 15 RECEIVED

Nov 09, 2011

Code E815

ASSIGNMENT OF OWNERSHIP NOT UPDATED AUTOMATICALLY

Jan 19, 2011

Code ASCK

TEAS CHANGE OF CORRESPONDENCE RECEIVED

Oct 28, 2009

Code TCCA

REGISTERED-PRINCIPAL REGISTER

May 02, 2006

Code R.PR

PUBLISHED FOR OPPOSITION

Feb 07, 2006

Code PUBO

NOTICE OF PUBLICATION

Jan 18, 2006

Code NPUB

LAW OFFICE PUBLICATION REVIEW COMPLETED

Dec 23, 2005

Code PREV

ASSIGNED TO LIE

Dec 09, 2005

Code ALIE

APPROVED FOR PUB - PRINCIPAL REGISTER

Dec 04, 2005

Code CNSA

ASSIGNED TO EXAMINER

Dec 01, 2005

Code DOCK

TEAS VOLUNTARY AMENDMENT RECEIVED

Jun 23, 2005

Code PARI

NEW APPLICATION ENTERED

May 12, 2005

Code NWAP

Other Marks by Siliconix Incorporated

Additional USPTO filings from the same owner.

MIC

MICROBRICK

88689327

SILICONIX INCORPORATED

REGISTERED

POL

POLARPAK

78276867

Siliconix Incorporated

REGISTERED

LIT

LITTLE FOOT

74216274

SILICONIX INCORPORATED

REGISTERED

MIC

MICRO FOOT

76167508

Siliconix Incorporated

REGISTERED

Other Marks in Class 009 — Electronics, software & scientific instruments

Recently filed and registered marks in the same international class.

98049008

Soloinsight Inc.

REGISTERED

76217444

Graphic Security Systems Corporation

REGISTERED

79158470

SIEGENIA-AUBI KG

REGISTERED

88833259

Illustrated Syndicate, LLC

REGISTERED

Other Marks by John J. O'Malley

Additional USPTO filings handled by the same attorney of record.

FIB

FIBERPATROL

78508415

REGISTERED

FUL

FULLYN

79437196

79015703

ACUMEN

98904398

REGISTERED

SI

What to file next

Full Goods & Services

Filing Basis & Declarations

International Filings

Other Marks by Siliconix Incorporated

Other Marks in Class 009 — Electronics, software & scientific instruments

Other Marks by John J. O'Malley

Get pre-filing clearance

Search 14M+ trademarks

Run a conflict check

Industries

USPTO Deadlines

Compare

Resources

Company

Exceptions