US3112005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earphones
Assignee: National Research Council Canada
•
Filing: 1960-07-28
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Granted: 1963-11-26
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Expires: 1980-07-28
Abstract
No abstract record available.
Inventors
- 👤 Edgar A G Shaw
- 👤 George J Thiessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:06
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/225; H04M; H04M1/00; H04M1/02; H04M1/03; H04M1/04; H04M1/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A CIRCUMAURAL TYPE OF EARPHONE COMPRISING A RIGID, NON-POROUS CUP ADAPTED TO ENCLOSE THE EAR AND DEFINE AN ACOUSTIC CAVITY THEREAROUND; A CUSHION MEMBER MOUNTED AROUND THE EDGE OF THE CUP AND ADAPTED TO EFFECT A SUBSTANTIALLY AIR TIGHT SEAL WITH THE REGION OF THE HEAD SURROUNDING THE EAR; AN ENCLOSED DRIVER UNIT RIGIDLY ATTACHED TO THE CUP, SAID DRIVER UNIT HAVING ITS SOUND EMITTING SURFACE SPACED FROM BUT FACING THE EAR AND BEING MOUNTED SO AS TO RADIATE SOUND BOTH TOWARDS THE EAR AND INTO THE CAVITY; AND MEANS HAVING FREQUENCY DEPENDENT SOUND PERMEABILITY DISPOSED WITHIN THE CUP, THE SOUND PERMEABILITY OF SAID MEANS BEING SUCH THAT THE SOUND PRESSURE PENETRATES SUBSTANTIALLY THE WHOLE OF THE CAVITY AT FREQUENCIES BELOW 300 C.P.S. AND SUBSTANTIALLY CONFINES THE SOUND PRESSURE TO REGIONS OF THE CAVITY ADJACENT THE EAR AT FREQUENCIES ABOVE 3000 C.P.S.
Claim 2
Dependent Claim
142 words
A CIRCUMAURAL TYPE OF EARPHONE COMPRISING A RIGID, NON-POROUS CUP ADAPTED TO ENCLOSE THE EAR AND DEFINE AN ACOUSTIC CAVITY THEREAROUND; A CUSHION MEMBER MOUNTED AROUND THE EDGE OF THE CUP AND ADAPTED TO EFFECT A SUBSTANTIALLY AIR TIGHT SEAL WITH THE REGION OF THE HEAD SURROUNDING THE EAR; AN ENCLOSED DRIVER UNIT RIGIDLY ATTACHED TO THE CUP, SAID DRIVER UNIT HAVING ITS SOUND EMITTING SURFACE SPACED FROM BUT FACING THE EAR AND BEING MOUNTED SO AS TO RADIATE SOUND BOTH TOWARDS THE EAR AND INTO THE CAVITY; AND MEANS HAVING FREQUENCY DEPENDENT SOUND PERMEABILITY DISPOSED WITHIN THE CUP, THE SOUND PERMEABILITY OF SAID MEANS BEING SUCH THAT THE SOUND PRESSURE PENETRATES SUBSTANTIALLY THE WHOLE OF THE CAVITY AT FREQUENCIES BELOW 300 C.P.S. AND SUBSTANTIALLY CONFINES THE SOUND PRESSURE TO REGIONS OF THE CAVITY ADJACENT THE EAR AT FREQUENCIES ABOVE 3000 C.P.S.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |