US Patent No: 8,171,645

Number of patents in Portfolio can not be more than 2000

Knife blade opening mechanism

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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 55

Cited Art Landscape

Patent Info (Count) # Cites Year
 
LEATHERMAN TOOL GROUP, INC. (2)
* 7,676,931 Folding knife 14 2005
* 2009/0119,926 Folding Tool Having A Rotatable Locking Mechanism 11 2007
 
Other [Check patent profile for assignment information] (9)
* 5,819,414 Double action folding knife 55 1997
* 2004/0154,170 Releasable double locking knife 13 2004
* 7,380,340 Folding tool with inlay release 7 2005
* 7,243,430 Folding knife with opening and closing assistance 17 2005
* 7,698,821 Lock mechanism for spring assisted folding knife 13 2006
* 2007/0169,354 Lock Mechanism For Spring Assisted Folding Knife 15 2006
* 7,627,951 Bi-fold knife with locking and release mechanisms 6 2007
* 2009/0265,939 Folding knife with an unlocking mechanism 5 2008
* 7,918,028 Folding knife with thumb release opening 11 2008
 
MIZUTANI SCISSORS MFG CO., LTD. (1)
* 2002/0124,415 Scissors type cutting tool 15 2002
 
Buck Knives, Inc. (2)
* 7,107,686 Spring assist knife 17 2004
* 7,313,866 Spring assist knife 15 2006
 
TAYLOR BRANDS, LLC (1)
* 6,363,615 Folding knife with rotatable locking element and axial spring 33 2000
 
ACME UNITED CORPORATION (1)
* 5,044,079 Folding knife with open lock feature having improved spring element 121 1990
 
SUREFIRE, LLC (1)
* 2007/0137,047 Folding knife 7 2005
 
FISKARS BRANDS, INC. (2)
* 2006/0064,877 Folding knife 34 2003
* D639632 Knife handle 33 2009
 
GBII CORPORATION DOING BUSINESS AS COLUMBIA RIVER KNIFE AND TOOL (2)
* 7,437,822 Locking mechanism for folding knife 25 2006
* 2008/0201,953 Folding knife 21 2008
 
BTI TOOLS, LLC (2)
* 6,308,420 Folding knife with spring and cam 56 2000
* 6,651,344 Foldable knife structure 48 2002
 
ALTERRA HOLDINGS CORPORATION (1)
* 2004/0158,991 Safety for a folding knife 41 2003
 
SPYDERCO, INC. (1)
* 7,325,312 Folding knife with pivoting blade and guard 19 2006
 
MENTOR GROUP, L.L.C. (9)
* RE41259 Folding pocket knife with a lock 14 1998
* 6,574,869 Folding pocket knife with a lock 45 2000
* 6,675,484 Folding tool locking mechanism 41 2001
* 6,732,436 Folding tool 33 2002
* 7,278,213 Hand tool stop pin 18 2004
* 7,293,360 Knife blade opening mechanism 21 2006
* 7,748,122 Knife blade opening mechanism 15 2007
* 2009/0277,015 Release Button for Folding Knife 10 2008
* 2011/0099,817 Knife Blade Opening Mechanism 8 2011
 
Kai U.S.A., Ltd. (2)
* 2007/0180,702 Folding knife with sealed mechanism 7 2007
* 2009/0288,301 SAFETY LOCK MECHANISM FOR FOLDING KNIVES 6 2008
 
GREAT AMERICAN TOOL COMPANY, INC. (1)
* 7,086,157 Folding knife having a biased blade 21 2002
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (3)
* 8,458,913 Assisted-opening folding knife 0 2011
* 2012/0222,314 ASSISTED-OPENING FOLDING KNIFE 2 2011
* 8,499,460 Spring assisted knife having separate cam insert 6 2011
 
MILWAUKEE ELECTRIC TOOL CORPORATION (6)
* 8,707,564 Hand saw 0 2010
* 2010/0192,382 HAND SAW 1 2010
D703509 Utility knife 4 2013
D703510 Utility knife 5 2013
9,061,426 Knife 2 2013
9,352,473 Knife 0 2015
 
MENTOR GROUP, L.L.C. (4)
* 8,375,590 Knife blade opening mechanism 3 2011
* 2011/0099,817 Knife Blade Opening Mechanism 8 2011
* 8,572,851 Method of opening a knife blade 1 2013
* 2013/0145,598 Knife Blade Opening Mechanism 0 2013
* 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