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

Patent Owner(s)

Patent Owner	Address	Total Patents
HOLLINGSWORTH & VOSE COMPANY	EAST WALPOLE, MA	70

International Classification(s)

• B03C:MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATE....

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Gahan, Richard E	Wrentham, MA	11	150
Lifshutz, Norman	Nashua, NH	7	109
Stevens, Graham C	Quincy, MA	2	65

Cited Art Landscape

Patent Info	(Count)	# Cites	Year
Other [Check patent profile for assignment information] (1)
5099026 Fluorochemical oxazolidinones		80	1991
Minnesota Mining and Manufacturing Company (5)
* 4874399 Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene)		127	1988
5025052 Fluorochemical oxazolidinones		153	1990
5411576 Oily mist resistant electret filter media and method for filtering		132	1994
* 5417678 Low profile ostomy filter		16	1994
* 5472481 Oily mist resistant electret filter media		120	1995
INVISTA NORTH AMERICA S.A.R.L. (1)
* 5558809 Polymer electrets with improved charge stability		39	1995
TOYOBO CO., LTD. (1)
4789504 Electretized material for a dust filter		80	1986
Her Majesty the Queen in right of Canada as represented by the Minister of National Defence of Canadian Government (1)
* 5038775 Plastic scrim		38	1988
TORAY INDUSTRIES, INC. (1)
* 5057710 Electret materials and the method for preparing the electret materials		99	1990
W. L. Gore & Associates (UK) Ltd. (1)
* 5496396 Gas filter		11	1994
PALL CORPORATION (1)
* 4508775 Gas permeable composite structures		23	1983
HOLLINGSWORTH & VOSE COMPANY (1)
* 5645627 Charge stabilized electret filter media		55	1995
W. L. GORE & ASSOCIATES, INC. (1)
* 5242747 Gas permeable materials		10	1992
GORE HOLDINGS, INC. (1)
* 5342434 Gas permeable coated porous membranes		35	1993
MITSUI CHEMICALS, INC. (3)
4626263 High-performance electret and air filter		76	1985
5256176 Film electret and an electret filter		42	1991
* 5304227 Electret filters		23	1993

* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info	(Count)	# Cites	Year
DELSTAR ELECTROSTATIC, INC. (1)
9074301 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents		0	2011
Other [Check patent profile for assignment information] (2)
* 2003/0213,218 Filtering material and device and method of its manufacture		10	2003
9909767 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents		0	2014
3M INNOVATIVE PROPERTIES COMPANY (2)
* 7390351 Electrets and compounds useful in electrets		10	2006
* 2007/0180,997 ELECTRETS AND COMPOUNDS USEFUL IN ELECTRETS		11	2006
DELSTAR TECHNOLOGIES, INC. (1)
9618220 Filtration materials using fiber blends that contain strategically shaped fibers and/or charge control agents		0	2014
HOLLINGSWORTH & VOSE COMPANY (7)
* 8202340 Waved filter media and elements		8	2009
8257459 Waved filter media and elements		6	2009
* 2010/0107,881 WAVED FILTER MEDIA AND ELEMENTS		15	2009
8197569 Waved filter media and elements		9	2010
8882875 Waved filter media and elements		1	2012
9718020 Waved filter media and elements		0	2013
9687771 Waved filter media and elements		0	2014

* Cited By Examiner

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: 6780226

Charge stabilized electret filter media

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