Kershaw began as an independent knife brand in 1974. By 1977, Kershaw was doing so well that it was adopted into the Kai USA family, which includes Shun Cutlery and Zero Tolerance Knives. Based out of Oregon, Kershaw is well known for setting industry standards.
Kershaw’s work with Ken Onion produced the SpeedSafe assisted opening mechanism, opening the whole market to assisted knives. They have also produced many modern classics, including yet another Ken Onion design in the form of the Kershaw Leek.
From Kershaw as of October 2017:
"Kershaw Knives from Kai USA Ltd. carry a limited warranty for the lifetime of the original owner, except when stated otherwise. We guarantee our knives against manufacturing defects in material and construction and to perform as advertised when properly used and maintained. The Limited Lifetime Warranty is non-transferable and does not extend to normal signs of wear, rust, damage or breakage due to improper use, improper maintenance, accidents, loss, or theft. This warranty is void on products that have been modified in any way. Any product we determine to be defective will be repaired or replaced solely at our discretion. To receive warranty repair or replacement, the owner must send the product to be evaluated by Kai USA Warranty Services in our Tualatin, Oregon headquarters. In addition to the provisions of this warranty, the owner may also have other rights that can vary by state. The Limited Lifetime Warranty does not apply to the TX Tool. No other warranties are implied or expressed other than what is specifically stated here. Kai USA Ltd. reserves the right to determine what constitutes normal wear, improper use/maintenance, and modification
We reserve the right to make changes to this warranty at our discretion and without notice."