---- July 23rd 2024 ----

CAGE Code: 5DME2
ITAR Registration Code: M28889
Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions and requirements to: sales@coilws.com

Pricing is subject to change depending on product availability and backorders.
*Please Note: Items without price are listed for CWS' capability purposes.

Helical Winding Output Inductor Background


The original helix coil was invented by Chubb in 1911. It was an air coils, wound using a flat wire in a helix manner.

Around 1990, Williamson patented a series of designs of magnetic core inductors using the helix windings with claims that are sufficiently different than the original helix design for patents to be granted. Williamson patents claimed magnetic core inductor comprising in combination of, among other things,

  • helical windings where the elongated output tabs has a decreased width and cross sectional area relative to the width and cross sectional area of the turns,
  • each said helix coils being compacted, comprising n+1 turns but characterized by a height substantially equal to the height of a similar uncompacted coil of n turns.

The helical coils used in CWS's design follows the original Chubb's design where the above 2 features are not incorporated. In CWS's design, by having the output tabs the same width and cross sectional area as the rest of the turns, we are able to reduce the manufacturing cost substantially and make the coils mass manufacturable. This is because we can use a same uniform strip of coils to do the helix windings. CWS uses kapton insulation coating which has better dielectric ( hi-pot) and offer higher temperature characteristic.

In addition the helix coils are not compacted to make n+1 winding characterized by a height substantially equal to the height of a similar uncompacted coil of n turns. In CWS's coils, compacting the coils to achieve the above feature will cause the insulation layer to degrade and hence may lower the dielectric breakdown of the insulation.

Therefore, we believe CWS's HW series does not infringe of any known patents.

The Williamson patents are currently owned by Schott Corporation. Please refer to their patents for more information and their patents expiration dates.

Note: The above is the opinion of CWS's patent attorney and is not necessarily the views of any other parties.


Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go towww.P65Warnings.ca.gov.

Any Comments, Suggestions or Questions? Contact us!
Email: sales@coilws.com
CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

Tel: (714) 279-9010, Fax: (714) 279-9482

Copyright 2008, Coil Winding Specialist, Inc
Updated July, 2013

CAGE Code: 5DME2(Registered with www.ccr.gov)