Portable telephone auxiliary tone ringer and door alarm
USD331204S · kind S · design
8Cited by
6References
1Claims
0Family size
Inventor
Key dates
| Filing date | Apr 25, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Nov 24, 2006 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.