US Patent No: 8,171,645

Number of patents in Portfolio can not be more than 2000

Knife blade opening mechanism

ALSO PUBLISHED AS: 20100236078

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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, OR51

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Duey, Wes - 9 36

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MENTOR GROUP, L.L.C. (9)
RE41259 Folding pocket knife with a lock 10 1998
6,574,869 Folding pocket knife with a lock 41 2000
6,675,484 Folding tool locking mechanism 36 2001
6,732,436 Folding tool 28 2002
7,278,213 Hand tool stop pin 16 2004
7,293,360 Knife blade opening mechanism 14 2006
7,748,122 Knife blade opening mechanism 11 2007
2009/0277,015 Release Button for Folding Knife 8 2008
2011/0099,817 Knife Blade Opening Mechanism 4 2011
 
TAYLOR BRANDS, LLC (3)
6,308,420 Folding knife with spring and cam 50 2000
6,363,615 Folding knife with rotatable locking element and axial spring 29 2000
6,651,344 Foldable knife structure 43 2002
 
BUCK KNIVES, INC. (2)
7,107,686 Spring assist knife 14 2004
7,313,866 Spring assist knife 10 2006
 
FISKARS BRANDS, INC. (2)
2006/0064,877 Folding knife 21 2003
D639632 Knife handle 21 2009
 
GBII CORPORATION, DOING BUSINESS AS COLUMBIA RIVER KNIFE AND TOOL (2)
7,437,822 Locking mechanism for folding knife 15 2006
2008/0201,953 Folding knife 16 2008
 
KAI U.S.A., LTD., DBA KERSHAW KNIVES (2)
2007/0180,702 Folding knife with sealed mechanism 7 2007
2009/0288,301 SAFETY LOCK MECHANISM FOR FOLDING KNIVES 5 2008
 
LEATHERMAN TOOL GROUP, INC. (2)
7,676,931 Folding knife 11 2005
2009/0119,926 Folding Tool Having A Rotatable Locking Mechanism 9 2007
 
ACME UNITED CORPORATION (1)
5,044,079 Folding knife with open lock feature having improved spring element 119 1990
 
ALTERRA HOLDINGS CORPORATION (1)
2004/0158,991 Safety for a folding knife 36 2003
 
GREAT AMERICAN TOOL COMPANY, INC. (1)
7,086,157 Folding knife having a biased blade 17 2002
 
MIZUTANI SCISSORS MFG CO., LTD. (1)
2002/0124,415 Scissors type cutting tool 14 2002
 
SPYDERCO, INC. (1)
7,325,312 Folding knife with pivoting blade and guard 12 2006
 
SUREFIRE, LLC (1)
2007/0137,047 Folding knife 6 2005
 
Other [Check patent profile for assignment information] (9)
5,819,414 Double action folding knife 47 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 12 2005
7,698,821 Lock mechanism for spring assisted folding knife 10 2006
2007/0169,354 Lock Mechanism For Spring Assisted Folding Knife 13 2006
7,627,951 Bi-fold knife with locking and release mechanisms 5 2007
2009/0265,939 Folding knife with an unlocking mechanism 5 2008
7,918,028 Folding knife with thumb release opening 5 2008

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MILWAUKEE ELECTRIC TOOL CORPORATION (3)
8,707,564 Hand saw 0 2010
D703509 Utility knife 0 2013
D703510 Utility knife 0 2013
 
MENTOR GROUP, L.L.C. (2)
8,375,590 Knife blade opening mechanism 2 2011
8,572,851 Method of opening a knife blade 0 2013
 
Other [Check patent profile for assignment information] (2)
8,458,913 Assisted-opening folding knife 0 2011
8,499,460 Spring assisted knife having separate cam insert 2 2011

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
3.5 Year Payment $1600.00 $800.00 $400.00 Nov 8, 2015
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 - 3.5 year - Late payment within 6 months $160.00 $80.00 $40.00
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

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