Patent US4458778A successfully refreshed from Google Patents.
US4458778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stethoscope construction
Assignee: Individual
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Filing: 1981-03-23
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Granted: 1984-07-10
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Expires: 2001-03-23
Abstract
Abstract A microphone for stethoscopes and the like having a weighted head member with a recessed cavity formed therein. A diaphragm is sealed to the head member with an adhesive material to provide an airtight cover for the cavity. The mass of the head member causes it to remain substantially vibration free and as a result all vibrations are transmitted directly to the diaphragm causing it to vibrate with increased amplitude at all frequencies. The adhesive seal between the diaphragm and the head member effectively eliminates secondary vibration thereof so that the microphone is capable of producing a distortion free air signal of high amplitude at all normal frequencies.
Inventors
- 👤 Max Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:38
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A microphone for stethoscopes and the like comprising: a. a metallic head member having a recessed cavity formed therein with an interior passage extending from said cavity to the exterior of said head member, said head member having a weight of at least approximately 10 ounces; b. a diaphragm attached to said head member covering said cavity in an airtight manner; c. connecting means for securing said head member to the transmission portion of a stethoscope and the like and providing an airtight relationship between said transmission portion and said passage.
Claim 2
Dependent Claim
91 words
A microphone for stethoscopes and the like comprising: a. a metallic head member having a recessed cavity formed therein with an interior passage extending from said cavity to the exterior of said head member, said head member having a weight of at least approximately 10 ounces; b. a diaphragm attached to said head member covering said cavity in an airtight manner; c. connecting means for securing said head member to the transmission portion of a stethoscope and the like and providing an airtight relationship between said transmission portion and said passage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |