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

Patent Owner(s)

Patent Owner	Address
SHENZHEN VERDEWELL TECHNOLOGY LIMITED	NO 6-1 DONGCAI INDUSTRIAL ZONE GUSHU COMMUNITY XIXIANG STREET BAO'AN DISTRICT SHENZHEN GUANGDONG 518102

International Classification(s)

• 2702:PIPES, CIGAR AND CIGARETTE HOLDERS

• 2021 Application Filing Year
• 2702 Class
• 199 Applications Filed
• 199 Patents Issued To-Date
• 100 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Wang, Jianliang	Guangdong, CN	40	750
# of filed Patents : 40 Total Citations : 750

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Patent Citation Ranking

• 4 Citation Count
• 2702 Class

• 76.32 % this patent is cited more than
• 2 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
3.5 Year Payment	$1600.00	$800.00	$400.00	Mar 26, 2027
7.5 Year Payment	$3600.00	$1800.00	$900.00	Mar 26, 2031
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Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 3.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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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: 6947224

Methods to make diffractive optical elements

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Abstract

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A method for forming a diffractive lens includes forming an etch stop layer on a first surface of a silicon substrate, forming a diffractive optical element above the etch stop layer, forming a planarization layer covering the diffractive optical element, planarizing the planarization layer, forming a bonding layer on the planarization layer, bonding a transparent substrate on the bonding layer, and etching a second surface of the silicon substrate to the etch stop layer to remove a portion of the silicon substrate opposite the diffractive optical element, wherein the remaining portion of the silicon substrate forms a bonding ring.

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Description

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Claims

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Date	Code	Event	Description
Feb 02, 2023	AS	ASSIGNMENT	free format text: MERGER;ASSIGNORS:AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED;BROADCOM INTERNATIONAL PTE. LTD.;REEL/FRAME:062952/0850 Owner name: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED, SINGAPORE Effective Date: Feb 02, 2023
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Sep 20, 2005	I	Issuance
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Sep 19, 2003	F	Filing
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