Sound conditioner for masking intruding noises
USD311065S · kind S · design
16Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Oct 2, 2004 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.