Carbon Fiber Handles

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Design patent question?

Can I be held liable for copying part of another's (unpatented) product in my product?

Here's what happened:
I designed and produced an "ax" The innovation in my "ax" is in the carbon fiber handle which I designed.
In order to go into production, I needed to mate it to a head.
I chose some of the best ax heads on the market, and made a similar design with my own mating system to hold onto the handle.
Not understanding my instructions, my designer cloned the competition's head, except for the mating system.
As far as I know, his head is unpatented (a simple USPTO search turned up nothing)

It is now too late, and the "ax" is on the market.

What are my risks?

If the design is un-patented then it is fine.

The Axe head would have to have been something totally new and differant to have been patented in the first place.

Bit like worrying if you can be sued by another shoe company because you made a shoe too.

:-)

Find Carbon Fiber Handles On eBay Below:

Spyderco Brend Pirela Mamba Flipper Knife with Carbon Fiber Handles C196CFTIP
Spyderco Brend Pirela Mamba Flipper Knife with Carbon Fiber Handles C196CFTIP
$379.95
Spyderco Sage Folder 30 in Plain Carbon Fiber Handle
Spyderco Sage Folder 30 in Plain Carbon Fiber Handle
$166.06
Cold Steel Golden Eye Folder 35in Plain Carbon Fiber Handle
Cold Steel Golden Eye Folder 35in Plain Carbon Fiber Handle
$232.39
SPYDERCO Native 5 Plain Edge CPM S90V Steel Fluted Carbon Fiber Handle C41CFFP5
SPYDERCO Native 5 Plain Edge CPM S90V Steel Fluted Carbon Fiber Handle C41CFFP5
$233.97
Zero Tolerance 0460 Folding Knife 325 S35VN Bronze carbon fiber Handle
Zero Tolerance 0460 Folding Knife 325 S35VN Bronze carbon fiber Handle
$220.00
New 440 Blade Carbon fiber Handle High Quality Pocket Folding knife EDC 327
New 440 Blade Carbon fiber Handle High Quality Pocket Folding knife EDC 327
$14.99
Shirogorov 95 S90V blade full flat grind titanium carbon fiber inlay handle
Shirogorov 95 S90V blade full flat grind titanium carbon fiber inlay handle
$1,799.00
Ontario RAT II Folder 3 AUS 8 Blade Steel Carbon Fiber Handle 8838
Ontario RAT II Folder 3 AUS 8 Blade Steel Carbon Fiber Handle 8838
$41.99
Ontario RAT II Folder 3 AUS 8 Blade Steel Carbon Fiber Handle 8836
Ontario RAT II Folder 3 AUS 8 Blade Steel Carbon Fiber Handle 8836
$40.99
 New Benchmade 940S 1 Axis Lock Knife S90V Serrated Blade Carbon Fiber Handle
New Benchmade 940S 1 Axis Lock Knife S90V Serrated Blade Carbon Fiber Handle
$267.75
 NEW BENCHMADE OSBORNE CARBON FIBER HANDLE S90V STEEL COMBO EDGE KNIFE 940S 1
NEW BENCHMADE OSBORNE CARBON FIBER HANDLE S90V STEEL COMBO EDGE KNIFE 940S 1
$267.75
 NEW Benchmade 940 1 Osborne CPM S90V Reverse Tanto Blade Carbon Fiber Handle
NEW Benchmade 940 1 Osborne CPM S90V Reverse Tanto Blade Carbon Fiber Handle
$267.75
Richard Rogers Custom Axiom CTS XHP Grooved Carbon Fiber Handle 2017 Blade Show
Richard Rogers Custom Axiom CTS XHP Grooved Carbon Fiber Handle 2017 Blade Show
$2,050.00
Cutlery KI1014 Thumbper Long Fixed Knife 2125 Blade Carbon Fiber Handle
Cutlery KI1014 Thumbper Long Fixed Knife 2125 Blade Carbon Fiber Handle
$137.64
Stedemon ZKC A01 Folding Knife 275 S35VN Blade Titanium Carbon Fiber Handle
Stedemon ZKC A01 Folding Knife 275 S35VN Blade Titanium Carbon Fiber Handle
$230.09
Stedemon ZKC A01 Folding Knife 275 S35VN Blade Titanium Carbon Fiber Handle
Stedemon ZKC A01 Folding Knife 275 S35VN Blade Titanium Carbon Fiber Handle
$230.09
Spring Assist Linerlock Knife Carbon Fiber Pattern Handle Fast Ship
Spring Assist Linerlock Knife Carbon Fiber Pattern Handle Fast Ship
$10.70
 New Zero Tolerance ZT Large Sinkevich Carbon Fiber Handle Flipper Knife 0460
New Zero Tolerance ZT Large Sinkevich Carbon Fiber Handle Flipper Knife 0460
$180.00
Stedemon UncleOne Fixed Knife 425 10Cr15CoMoV Steel Blade Carbon Fiber Handle
Stedemon UncleOne Fixed Knife 425 10Cr15CoMoV Steel Blade Carbon Fiber Handle
$179.95
Guardian Tactical Helix Nano Framelock Black Carbon Fiber Handle Knife 62511
Guardian Tactical Helix Nano Framelock Black Carbon Fiber Handle Knife 62511
$329.00
Bastion Damascus Straight Folding Damascus Steel Razor Carbon Fiber Handle TN221
Bastion Damascus Straight Folding Damascus Steel Razor Carbon Fiber Handle TN221
$99.99
Bastion BRAZA Linerlock Titanium  Carbon Fiber Handle Stainless Knife TN214
Bastion BRAZA Linerlock Titanium Carbon Fiber Handle Stainless Knife TN214
$159.99
Bastion Carbon Fiber EDC Black Curved Handle Standard Edge Fixed Knife TN06
Bastion Carbon Fiber EDC Black Curved Handle Standard Edge Fixed Knife TN06
$58.99
Bastion Partizan Framelock Carbon Fiber Handle D2 Tool Steel Folding Knife TN11
Bastion Partizan Framelock Carbon Fiber Handle D2 Tool Steel Folding Knife TN11
$149.99
Bastion Carbon Fiber EDC Black Straight Handle Standard Edge Fixed Knife TN05
Bastion Carbon Fiber EDC Black Straight Handle Standard Edge Fixed Knife TN05
$58.99
EF04 Folding Blade Knife D2 Blade Carbon Fiber G10 Handle Tactical Knife Surviv
EF04 Folding Blade Knife D2 Blade Carbon Fiber G10 Handle Tactical Knife Surviv
$35.63
Benchmade Nakamura Axis 484 1 Plain Drop Point Carbon Fiber Handle New
Benchmade Nakamura Axis 484 1 Plain Drop Point Carbon Fiber Handle New
$334.66
New Benchmade Nakamura Axis Plain Drop Point Carbon Fiber Handle Serrated Edge
New Benchmade Nakamura Axis Plain Drop Point Carbon Fiber Handle Serrated Edge
$351.80
Spyderco 40th anniversary Native 5 Carbon Fiber Handles Thor Damascus C41CF40TH
Spyderco 40th anniversary Native 5 Carbon Fiber Handles Thor Damascus C41CF40TH
$349.99
Gatco Timberline Vallotton Classic 35 Plain Carbon Fiber Handle Ti Frame 1243
Gatco Timberline Vallotton Classic 35 Plain Carbon Fiber Handle Ti Frame 1243
$51.95
Spyderco Chaparral Folder 281 in Plain Carbon Fiber Handle
Spyderco Chaparral Folder 281 in Plain Carbon Fiber Handle
$127.37
Benchmade 484 1 Nakamura AXIS Lock S90V Blade Carbon Fiber Handle
Benchmade 484 1 Nakamura AXIS Lock S90V Blade Carbon Fiber Handle
$122.50
Boker Anti Grav Folder 325 in Blade Carbon Fiber Handle
Boker Anti Grav Folder 325 in Blade Carbon Fiber Handle
$94.37
SPYDERCO New Carbon Fiber Handle Caly 35 With Pln Edge ZDP189 Bld Knife Knives
SPYDERCO New Carbon Fiber Handle Caly 35 With Pln Edge ZDP189 Bld Knife Knives
$189.00
SPYDERCO GAYLE BRADLEY2 C134CFP2 36 M4 STEEL BLADE CARBON FIBER HANDLE NEW
SPYDERCO GAYLE BRADLEY2 C134CFP2 36 M4 STEEL BLADE CARBON FIBER HANDLE NEW
$158.00
Damascus Steel Carbon Fiber Handle Razor Pocket Folding Knife with Belt Clip
Damascus Steel Carbon Fiber Handle Razor Pocket Folding Knife with Belt Clip
$35.99
Surefire Bravo Knife Carbon Fiber Handle A069 Discontinued Collector
Surefire Bravo Knife Carbon Fiber Handle A069 Discontinued Collector
$359.00
Benchmade 940 1 Osborne Folding Knives CPM S90V Blade Carbon Fiber Handle
Benchmade 940 1 Osborne Folding Knives CPM S90V Blade Carbon Fiber Handle
$267.75
Boker Annual Folding Knife 275 Damascus Steel Blade Black Carbon Fiber Handle
Boker Annual Folding Knife 275 Damascus Steel Blade Black Carbon Fiber Handle
$359.69

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