Knife blade opening mechanism

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8171645
APP PUB NO 20100236078A1
SERIAL NO

12792920

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A folding knife incorporates an opening assist mechanism that functions to drive the blade from the closed to the open position. A pair of torsion springs held axially on the blade axis pin and within a pair of bushings are stationary relative to the knife handle. One leg of each spring is fixed to a bushing. The opposite leg of the spring rides in a pocket formed in the surface on the blade axially around the opening through which the blade axis pin is inserted. As the blade rotates from the closed position toward the open position, the legs of the springs rotate through and cooperate with structures formed on the bushings to transfer the spring pressure instantly to the blade to drive the blade open.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Mentor Group, L.L.C.OREGON CITY, OR50

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Duey, Wes Oregon City, US 7 93

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Leatherman Tool Group, Inc. (2)
* 7676931 Folding knife 23 2005
* 2009/0119,926 Folding Tool Having A Rotatable Locking Mechanism 15 2007
 
Other [Check patent profile for assignment information] (9)
* 5819414 Double action folding knife 61 1997
* 2004/0154,170 Releasable double locking knife 17 2004
* 7380340 Folding tool with inlay release 11 2005
* 7243430 Folding knife with opening and closing assistance 22 2005
* 7698821 Lock mechanism for spring assisted folding knife 18 2006
* 2007/0169,354 Lock Mechanism For Spring Assisted Folding Knife 22 2006
* 7627951 Bi-fold knife with locking and release mechanisms 14 2007
* 2009/0265,939 Folding knife with an unlocking mechanism 8 2008
* 7918028 Folding knife with thumb release opening 16 2008
 
Mizutani Scissors Mfg. Co., Ltd. (1)
* 2002/0124,415 Scissors type cutting tool 18 2002
 
BUCK KNIVES, INC. (2)
* 7107686 Spring assist knife 29 2004
* 7313866 Spring assist knife 26 2006
 
TAYLOR BRANDS, LLC (1)
* 6363615 Folding knife with rotatable locking element and axial spring 38 2000
 
ACME UNITED CORPORATION (1)
* 5044079 Folding knife with open lock feature having improved spring element 127 1990
 
SUREFIRE LLC (1)
* 2007/0137,047 Folding knife 11 2005
 
FISKARS BRANDS, INC. (2)
* 2006/0064,877 Folding knife 42 2003
* D639632 Knife handle 38 2009
 
GBII CORPORATION DBA COLUMBIA RIVER KNIFE AND TOOL (2)
* 7437822 Locking mechanism for folding knife 40 2006
* 2008/0201,953 Folding knife 30 2008
 
BATTENFELD TECHNOLOGIES, INC. (2)
* 6308420 Folding knife with spring and cam 67 2000
* 6651344 Foldable knife structure 51 2002
 
ALTERRA HOLDINGS CORPORATION (1)
* 2004/0158,991 Safety for a folding knife 45 2003
 
SPYDERCO, INC. (1)
* 7325312 Folding knife with pivoting blade and guard 24 2006
 
Mentor Group, L.L.C. (9)
* RE41259 Folding pocket knife with a lock 19 1998
* 6574869 Folding pocket knife with a lock 50 2000
* 6675484 Folding tool locking mechanism 49 2001
* 6732436 Folding tool 40 2002
* 7278213 Hand tool stop pin 23 2004
* 7293360 Knife blade opening mechanism 30 2006
* 7748122 Knife blade opening mechanism 21 2007
* 2009/0277,015 Release Button for Folding Knife 14 2008
* 2011/0099,817 Knife Blade Opening Mechanism 13 2011
 
KAI U.S.A., Ltd. (2)
* 2007/0180,702 Folding knife with sealed mechanism 10 2007
* 2009/0288,301 SAFETY LOCK MECHANISM FOR FOLDING KNIVES 9 2008
 
W.R. CASE & SONS CUTLERY COMPANY (1)
* 7086157 Folding knife having a biased blade 29 2002
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (4)
* 8458913 Assisted-opening folding knife 0 2011
* 2012/0222,314 ASSISTED-OPENING FOLDING KNIFE 2 2011
* 8499460 Spring assisted knife having separate cam insert 7 2011
9815213 Knife with ambidextrous actuators and locking mechanism 0 2014
 
MILWAUKEE ELECTRIC TOOL CORPORATION (8)
* 8707564 Hand saw 1 2010
* 2010/0192,382 HAND SAW 1 2010
D703509 Utility knife 4 2013
D703510 Utility knife 11 2013
9061426 Knife 3 2013
9352473 Knife 0 2015
D769693 Utility knife 0 2015
D769692 Utility knife 4 2015
 
BENCHMADE KNIFE CO., INC. (2)
9527218 Folding knife with dual operational modes 1 2013
9505141 Folding knife with dual operational modes 1 2013
 
Mentor Group, L.L.C. (4)
* 8375590 Knife blade opening mechanism 6 2011
* 2011/0099,817 Knife Blade Opening Mechanism 13 2011
* 8572851 Method of opening a knife blade 4 2013
* 2013/0145,598 Knife Blade Opening Mechanism 0 2013
 
GERBER SAKAI CO., LTD. (1)
* 9808940 Folding knife with blade open assisting function 0 2016
* Cited By Examiner

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 Nov 8, 2019
11.5 Year Payment $7400.00 $3700.00 $1850.00 Nov 8, 2023
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
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