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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE LTD	SINGAPORE SINGAPORE SINGAPORE CITY SINGAPORE

International Classification(s)

• H03B:GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUEN....

• 1997 Application Filing Year
• H03B Class
• 247 Applications Filed
• 137 Patents Issued To-Date
• 55.47 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Barnett, Raymond E	Rosemount, MN	19	185
# of filed Patents : 19 Total Citations : 185
Ngo, Tuan V	Eden Prairie, MN	32	389
# of filed Patents : 32 Total Citations : 389

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Patent Citation Ranking

• 7 Citation Count
• H03B Class

• 2.80 % this patent is cited more than
• 26 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 5990710

High performance write driver for magnetic inductive recording head

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Abstract

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A circuit is provided to switch a drive transistor in a write driver circuit controlled by a write control signal to direct write current in a selected direction through an inductive head. Current is selectively conducted from a control region of the drive transistor in response to switching of the write control signal. A first bias circuit limits voltage fluctuation at the control region of the drive transistor. A second bias circuit prevents saturation of the drive transistor.

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Description

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Claims

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Legal Events

 

• AS2017
• AS�2016
• AS2016
• AS2014
• AS�2014
• FPAY2011
• FPAY2007
• REMI2003
• FPAY2003
• FEPP2002
• FEPP2000
• I1999
• STCF1999
• F1997
• AS1997
• PD1996

Date	Code	Event	Description
Jan 19, 2017	AS	ASSIGNMENT	free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS;ASSIGNOR:BANK OF AMERICA, N.A., AS COLLATERAL AGENT;REEL/FRAME:041710/0001 Owner name: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD., SINGAPORE Effective Date: Jan 19, 2017 free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS;ASSIGNOR:BANK OF AMERICA, N.A., AS COLLATERAL AGENT;REEL/FRAME:041710/0001 Owner name: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD Effective Date: Jan 19, 2017
Feb 01, 2016	AS�	SECURITY INTEREST	free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.;REEL/FRAME:037808/0001 Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, NORTH CAROLINA Effective Date: Feb 01, 2016 free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.;REEL/FRAME:037808/0001 Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, NORTH Effective Date: Feb 01, 2016
Feb 01, 2016	AS	ASSIGNMENT	free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENT RIGHTS (RELEASES RF 032856-0031);ASSIGNOR:DEUTSCHE BANK AG NEW YORK BRANCH, AS COLLATERAL AGENT;REEL/FRAME:037684/0039 Owner name: LSI CORPORATION, CALIFORNIA Effective Date: Feb 01, 2016 free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENT RIGHTS (RELEASES RF 032856-0031);ASSIGNOR:DEUTSCHE BANK AG NEW YORK BRANCH, AS COLLATERAL AGENT;REEL/FRAME:037684/0039 Owner name: AGERE SYSTEMS LLC, PENNSYLVANIA Effective Date: Feb 01, 2016
Aug 04, 2014	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AGERE SYSTEMS LLC;REEL/FRAME:035365/0634 Owner name: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD Effective Date: Aug 04, 2014
May 06, 2014	AS�	SECURITY INTEREST	free format text: PATENT SECURITY AGREEMENT;ASSIGNORS:LSI CORPORATION;AGERE SYSTEMS LLC;REEL/FRAME:032856/0031 Owner name: DEUTSCHE BANK AG NEW YORK BRANCH, AS COLLATERAL AG Effective Date: May 06, 2014
May 23, 2011	FPAY	FEE PAYMENT	year of fee payment: 12
May 18, 2007	FPAY	FEE PAYMENT	year of fee payment: 8
Jun 11, 2003	REMI	MAINTENANCE FEE REMINDER MAILED
May 23, 2003	FPAY	FEE PAYMENT	year of fee payment: 4
Dec 06, 2002	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Dec 05, 2000	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Nov 23, 1999	I	Issuance
Nov 15, 1999	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Jun 02, 1997	F	Filing
May 14, 1997	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NGO, TUAN V.;BARNETT, RAYMOND E.;REEL/FRAME:008610/0597 Owner name: VTC, INC., MINNESOTA Effective Date: May 14, 1997
Jun 13, 1996	PD	Priority Date