Other

Pola Chemical Industries, Inc.

Hiroaki Takayanagi

Hisao Wakabayashi

Yoshiyuki Miyata

Tsutomu Takeuchi

Masakazu Sakaguchi

Toshinori Ide

Seiki Kobayashi

Yumiko Suzuki

Toshiya Hayashi

Yoko Sato

Yumiko Osa

Dibenzosuberanyl piperazine derivatives represented by the following formula (I):wherein R represents an aliphatic hydrocarbon group, which may contain one or more heteroatom-containing substituent groups and may preferably contain 2 to 30 carbon atoms, and physiologically acceptable salts thereof; and medicinal compositions containing these dibenzosuberanyl piperazine derivatives and/or physiologically acceptable salts thereof. These compounds show effectiveness in allowing resistance-acquired causes of diseases to restore sensitivity to drug, that is, a resistance overcoming effect.

Dibenzosuberanyl piperazine derivatives and drug-resistance overcoming agents containing the derivatives

A base (,) has a substantially cylindrical plug (,) penetrated by two leads,A piezoelectric oscillator (,) is secured to and supported on ends of the two leads by supports (,). The supports (,) are formed from solder having as high lead content of more than 60% by weight, preferably 85 to 98% by weight. A cap (,) open at one end is fitted on the piezoelectric oscillator (,). The plug (,) seals the open end of the cap (,) and forms a gas-tight casing, thus forming a piezoelectric oscillator unit with piezoelectric oscillator (,) held gas-tight in the inside. The high lead content solder is soft and has a low Young's Modulus, so that it can disperse stress when the piezoelectric oscillator experiences. It is thus possible to evade stress concentration on the piezoelectric oscillator (,) and improve shock resistance. A layer of a solder with a lead content of 60% by weight or less or of tin or a tin alloy, is formed on the surface of the leads (,), and ensures solder wetting property.

Piezoelectric vibrator

Growing community of inventors

Saitama, Japan

Hiroaki Takayanagi