Patents Represented by Law Firm Mechant, Gould, Smith, Edell, Welter & Schmidt, P.A.
  • Resonator ladder surface acoustic wave filter suppressing spurious signals
    Patent number: 5729186
    Abstract: A resonator ladder surface acoustic wave (SAW) filter, which has a wide and flat pass band without spurious signals therein is provided. An input electrode, a serial arm SAW resonator, an output electrode, a parallel arm SAW resonator and a ground electrode are respectively formed on a 41.degree.-rotated Y-cut X-propagation lithium niobate substrate. The serial arm SAW resonator comprises a pair of interdigital transducers (IDTs) to excite SAW, one of which is connected to the input electrode. The output electrode is connected to the other IDT of the serial arm SAW resonator. The parallel arm SAW resonator comprises a pair of IDTs to excite SAW, one of which is connected to the output electrode. And the ground electrode is connected to the other IDT of the parallel arm SAW resonator. The IDTs are metal films of Al or Al-based alloy, and the thickness of the metal films ranges from 2.5% to 7.5% of the electrode cycle of the IDT of the parallel arm SAW resonator.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: March 17, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shun-ichi Seki, Kazuo Eda, Yutaka Taguchi, Keiji Onishi, Hiroki Sato, Osamu Kawasaki
  • Ergonomic, single hand, folding painter's tool
    Patent number: D399621
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: October 13, 1998
    Assignee: Warner Manufacturing Company
    Inventor: David R. Henke