Magnetic clasp for wristwatch strap
US4941236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Jul 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/4782
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A strap for holding a wristwatch has a pair of separable flexible strap ends adapted to curve around the wrist and to overlap one another to provide an overlapped section. At least one strap end of thermoplastic material has particles of permanently magnetizable material embedded in the thermoplastic material and magnetized to provide rows of alternating magnetic poles. The strap ends have surfaces contacting one another throughout the overlapped section and mutually nesting uniformly spaced interlocking teeth, whereby the magnetized particles provide a holding force resisting separation of the strap ends, while the nested teeth prevent sliding disengagement movement between strap ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.