Waterproof watch and method for making
US4293942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1979 |
| Grant date | Oct 6, 1981 |
| Priority date | — |
| Expiry date | Nov 29, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12944
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A waterproof watch having a case and a base which are sealed in a water tight manner without the use of screw threads, is provided. The watch base is composed of a memory form alloy which may or may not be reversible. The watch base is deformed while in its Martensitic state and loosely fit adjacent a sealing portion of the case. The base is then permitted to rise above the Martensit/Austenit conversion temperature into its Austenitic state so that it returns to its undeformed shape and engages the sealing portion of the case in a water tight pressure fitting manner. The conversion temperature should be -20.degree. C. or below. A tubular conduit for the winding stem may also be composed of memory form alloy for sealing engagement with the case.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.