US4584702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise cancelling telephone transmitter insertable in telephone handset receptacle
Assignee: Plantronics Inc
•
Filing: 1983-12-19
•
Granted: 1986-04-22
•
Expires: 2003-12-19
Abstract
Abstract A noise cancelling telephone transmitter comprising a cap and a cup coupled together so as to form an assembly insertable as a unit in the receptacle of a telephone handset. The cap is provided with an opening for passing sound. The inlet of the cap opening is covered by an acoustically deformable material such as a Mylar membrane. An electret microphone is mounted within the assembly such that the microphone acoustic entrance faces the outlet of the cap opening. A ring-shaped acoustic damping element is interposed between the cap underside and the plane of the microphone acoustic entrance. The cap is provided with a depending acoustic baffle which surrounds the damping element proximate the plane of the microphone acoustic entrance.
Inventors
- 👤 Wesley F. Walker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:50
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/19; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/222
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
170 words
A telephone transmitter insertable in the transmitter receptacle of a telephone handset, comprising: a cap provided with an opening for passing sound, and an acoustically deformable material secured to the top side of the cap so as to cover the inlet of said opening, a cup coupled to said cap whereby said cap and cup form an assembly insertable as a unit in the transmitter receptacle of the telephone handset, a microphone disposed within said unit and having a casing provided with an acoustic entrance facing the underside of said cap adjacent the outlet of said cap opening, an acoustic damping element disposed outside said microphone casing between said microphone casing and the underside of said cap adjacent the outlet of said cap opening, said acoustic damping element being provided with an opening disposed between the outlet of said cap opening and said microphone acoustic entrance whereby said cap opening and said acoustic damping element opening form a sound channel between said acoustically deformable material and said microphone acoustic entrance.
Claim 2
Dependent Claim
170 words
A telephone transmitter insertable in the transmitter receptacle of a telephone handset, comprising: a cap provided with an opening for passing sound, and an acoustically deformable material secured to the top side of the cap so as to cover the inlet of said opening, a cup coupled to said cap whereby said cap and cup form an assembly insertable as a unit in the transmitter receptacle of the telephone handset, a microphone disposed within said unit and having a casing provided with an acoustic entrance facing the underside of said cap adjacent the outlet of said cap opening, an acoustic damping element disposed outside said microphone casing between said microphone casing and the underside of said cap adjacent the outlet of said cap opening, said acoustic damping element being provided with an opening disposed between the outlet of said cap opening and said microphone acoustic entrance whereby said cap opening and said acoustic damping element opening form a sound channel between said acoustically deformable material and said microphone acoustic entrance.
Claim 3
Dependent Claim
16 words
The telephone transmitter according to claim 1 wherein said acoustically deformable material is a Mylar sheet.
Claim 4
Dependent Claim
23 words
The telephone transmitter according to claim 1 wherein said cap includes an acoustic baffle surrounding said acoustic damping element outside said microphone casing.
Claim 5
Dependent Claim
21 words
The telephone transmitter according to claim 3 wherein said acoustic baffle surrounds a region proximate the plane of said acoustic entrance.
Claim 6
Dependent Claim
18 words
The telephone transmitter according to claim 1 wherein said microphone casing is provided with noise cancelling side openings.
Claim 7
Dependent Claim
22 words
The telephone transmitter according to claim 3 wherein said acoustic baffle comprises an annular wall depending from the underside of the cap.
Claim 8
Dependent Claim
16 words
The telephone transmitter according to claim 2 wherein said Mylar sheet is approximately 2-3 mils thick.
Claim 9
Dependent Claim
19 words
The telephone transmitter according to claim 1 wherein said cap and cup are made of a plastic polymeric material.
Claim 10
Dependent Claim
24 words
The telephone transmitter according to claim 1 wherein said cap and cup are provided with structure for removably coupling the cap and cup together.
Claim 11
Dependent Claim
12 words
The telephone transmitter according to claim 1 wherein said cup is imperforate.
Claim 12
Dependent Claim
16 words
The telephone transmitter according to claim 1 wherein said acoustic damping element is a foam ring.
Claim 13
Dependent Claim
39 words
The telephone transmitter according to claim 1 wherein said cap opening is bounded by a beveled wall canted at approximately 30° to the vertical and wherein the outlet of said cap opening has a diameter of approximately 240 mils.
Claim 14
Dependent Claim
22 words
The telephone transmitter according to claim 6 wherein said annular wall projects downwardly approximately 75 mils from the underside of the cap.
Claim 15
Dependent Claim
17 words
The telephone transmitter according to claim 13 wherein said annular depending wall is approximately 120 mils thick.
References Cited (Backward Citations)
US664904A
Cited
US1372862A
Cited
US2118993A
Cited
US2311416A
Cited
FR929623A
Cited
US3536862A
Cited
US3660602A
Cited
US3830988A
Cited
US4009355A
Cited
US4424419A
Cited
US4463222A
Cited
US4449236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |