Patent technology portfolio for SAW filters
- Resource Type
- Conference
- Authors
- Kim, W.D.; Lee, K.R.
- Source
- 1994 Proceedings of IEEE Ultrasonics Symposium Ultrasonics Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE. 1:139-142 vol.1 1994
- Subject
- Signal Processing and Analysis
Fields, Waves and Electromagnetics
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Surface acoustic wave filters
Mobile communication
UHF radio communication
Patents
Surface acoustic wave device fabrication
- Language
Patent portfolio or patent mapping is a basic technology to pursuit research and development. The technology in patents goes 2 to 5 years ahead beyond the current devices and manufacturing technology. We had investigated the patents for the SAW (surface acoustic wave) filter through WPI (world patent index) and PATOLIS (patent on-line information system) database since 1971 through 1994. In this paper, we have found 690 US patents and 3,673 Japan patents. Zenith of USA has 14% of patents of 10 main companies, it is interesting to compare with 21% of USA navy and army secretaries and 13% of Clarion of Japan in USA issued patents. The history and trend of the SAW filter technology and the analysis of SAW filter manufacturing (actually patenting) companies are discussed include the ultrahigh frequency (UHF) SAW filters for mobile communication