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US4113999A Expired / Lapsed US ⏱️ 0.0 years remaining

Hand held communications microphone

Assignee: Individual
•
Filing: 1975-11-20
•
Granted: 1978-09-12
•
Expires: 1995-11-20
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Abstract

Abstract A microphone of the hand held type used in portable or remote radio communications systems in which improved resistance to shock, wet environmental conditions is achieved by using a resilient mounting means for a receiver disposed inside a hollow housing which includes a stop for limiting motion of the receiver in the resilient mounting means and through the use of a loosely mounted water impervious membrane over the active side of the receiver and further disposing an open cell, foamed plastic element over the outside of the plastic membrane.

Inventors

  • 👤 Frank Swinehart

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 12:55
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R1/083

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 192 words
The combination in a microphone comprising: a hollow housing, top and bottom major surfaces in said housing; an aperture on said top surface for receiving sound energy and transmitting sound energy into said housing; receiver means internal to said housing and in communication with said aperture comprising a case having an open top, a ceramic transducing means internal to said case, a plastic diaphragm supported in said case and connected to said transducing means, a damping element having a plurality of apertures disposed underneath said diaphragm, said plurality of apertures of said damping element covered by porous damping material; open cellular foam plastic material disposed between said apertures and said receiver means; a moisture impervious material loosely disposed between said open cellular material and said receiver means and means sealing said membrane over a top of said plastic diaphragm; a stop means on said bottom surface for limiting maximum displacement of said receiver means disposed between said surfaces; and, resilient mounting rubber gasket means disposed about said aperture surrounding a top of said receiver means and resilient mounting means opposite said aperture on said bottom surface being disposed within said stop means.
Claim 2
Dependent Claim 192 words
The combination in a microphone comprising: a hollow housing, top and bottom major surfaces in said housing; an aperture on said top surface for receiving sound energy and transmitting sound energy into said housing; receiver means internal to said housing and in communication with said aperture comprising a case having an open top, a ceramic transducing means internal to said case, a plastic diaphragm supported in said case and connected to said transducing means, a damping element having a plurality of apertures disposed underneath said diaphragm, said plurality of apertures of said damping element covered by porous damping material; open cellular foam plastic material disposed between said apertures and said receiver means; a moisture impervious material loosely disposed between said open cellular material and said receiver means and means sealing said membrane over a top of said plastic diaphragm; a stop means on said bottom surface for limiting maximum displacement of said receiver means disposed between said surfaces; and, resilient mounting rubber gasket means disposed about said aperture surrounding a top of said receiver means and resilient mounting means opposite said aperture on said bottom surface being disposed within said stop means.

References Cited (Backward Citations)

GB425186A Cited
US2556168A Cited
US2718563A Cited
US2709723A Cited
US2891131A Cited
US3548121A Cited
US3651286A Cited
US3660602A Cited
US3751600A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-09-11 1982-03-13 1982-09-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-09-11 1986-03-13 1986-09-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-09-11 1990-03-13 1990-09-12 $7700.00 Window Closed / Lapsed

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