Patent landscape on the navigation technology for bathyscaphe is investigated. Combining the quantitative analysis, qualitative research and expert advice, the article strives to render the current patenting activity characteristics; from multiple perspectives including the overall trend, geographical distribution, key assignees, the main technical branches and the technology-function features. And based on all the analyses, the article finally reveals current patenting characteristics comprehensively, in particular, compares the differences of patent filing between China and the global scope, and provides suggestion on the patenting priorities and potential risks.

This paper analyzes the keywords of 56,072 papers on quantum information science indexed in the Web of Science between 2002 to 2011 by using co-word analysis of bibliometrics analysis. According to multi variate statistical analysis, co-word cluster analysis, calculating class group adhesion, mapping keywords - keywords co-occurrence clustering tree, mapping core keywords connection network knowledge domains, we mine quantum information science research frontiers, from which we can see that the research of quantum information science are mainly on quantum cryptography, quantum computing, quantum entanglement, quantum dots, quantum wells, semiconductor quantum dots, quantum well lasers, quantum dot lasers, quantum information science experimental techniques and new materials research.