Assignee
No assignee recorded.
Inventors
- Marko T. Markov (2 patents)
- Chavdar B. Ivanov (3 patents)
- Unknown
- Unknown
- Nikolina D. Berova (3 patents)
- Unknown
- Unknown
- Unknown
- Unknown
- Unknown
- Unknown
- Radi G. Ovcharov (2 patents)
- Unknown
- Unknown
- Unknown
US Patent 4923877 · Granted May 8, 1990
No assignee recorded.