Motorola Corporation

Harold Holden

Charles W Mooney

Tuan K Nguyen

Thomas J Rollins

John R Benyo

A selective call receiver includes a vibrator (206) for generating alerts. The vibrator (206) includes a housing (402), a flexible member (2) within the housing (402) and coupled thereto, and a moving member (404) coupled to the flexible member (2) for movement about an equilibrium position, the moving member (404) including a permanent magnet (410). An actuator includes an electromagnet (412) for causing the permanent magnet (410) and the moving member (404) to move at a first frequency for generating an audible alert and at a second frequency for generating a sub-audible or tactile alert. The movement at the second frequency is substantially transferred to the housing (402) for generating the sub-audible or tactile alert.

Selective call receiver having audible and tactile alerts

A ceramic filter including a plurality of ceramic plates contacted by metal plates and enclosed within a housing includes a Teflon membrane having a plurality of bubbles or dimples therein. A curved spring plate is positioned between a wall of the housing and one of the metal plates. The shock absorbing membrane is positioned between the spring plate and the wall of the housing, and the bubbles thereof extend through openings in the spring plate. When the filter is subjected to a force substantially perpendicular to the ceramic plates, the bubbles in the shock absorber cause the edges of the metal plate to deflect upwards and thus support the adjacent ceramic plate so as to avoid shattering or cracking.

Shock absorber for ceramic filters

A battery contact (1) for connecting a battery (9) to an electric circuit (4) is comprised a first portion (2) for coupling to the electric circuit and a second portion (3) for coupling to the battery. The contact is made in one piece of electrically conductive sheet metal and is cut and bent so as to form the second portion into a tapered helical spring. The first portion (2) is formed with two retaining prongs (6,7) which facilitate locating and fixing the contact to the electric circuit (4) and a tab 8 which is used for soldering the contact to the electric circuit. In order to allow the contact to be easily picked-up in an automatic manufacturing line, a flat handling portion (11) is provided between the first and second portions.

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Boca Raton, FL, United States of America

Harold Holden