US3306991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective hearing aid
Assignee: Individual
•
Filing: 1963-06-04
•
Granted: 1967-02-28
•
Expires: 1983-06-04
Abstract
No abstract record available.
Inventors
- 👤 Homer J Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:36
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/14; A61F11/145; H; H04; H04R; H04R1/00; H04R1/10; H04R1/1058; H04R1/1066; H04R1/1083; H04R5/00; H04R5/033; H04R5/0335
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROTECTIVE HEARING AID COMPRISING IN COMBINATION: A HEADBAND ADAPTED TO BE WORN ON THE HEAD; A PAIR OF SOUND EXCLUDING EAR COVRS SUPPORTED BY SAID HEADBAND TO ENCLOSE THE OUTER EARS OF THE WEARER; MICROPHONE MEANS RESPONSIVE TO SOUNDS ORIGINATING EXTERIORLY OF SAID EAR COVERS; SOUND REPRODUCING TRANSDUCER MEANS RESPONSIVE TO SAID MICROPHONE MEANS TO REPRODUCE SOUNDS PICKED UP BY SAID MICROPHONE MEANS INTERIORLY OF AT LEAST ONE OF SAID EAR COVERS, A LIMITING AMPLIFIER TO CONTROL SAID REPRODUCED SOUNDS WITHIN A FINITE DYNAMIC RANGE, THE THE UPPER LIMIT OF WHICH IS BELOW THE DAMAGE RISK CRITERIA FOR HUMAN HEARING; MEANS ON THE EXTERNAL SURFACE OF ONE OF SAID PAIR OF EAR COVERS FOR MOUNTING SAID MICROPHONE MEANS; AND MEANS MOUNTING SAID REPRODUCING TRANSDUCER MEANS ON THE INTERIOR OF SAID ONE EAR COVER.
Claim 2
Dependent Claim
134 words
A PROTECTIVE HEARING AID COMPRISING IN COMBINATION: A HEADBAND ADAPTED TO BE WORN ON THE HEAD; A PAIR OF SOUND EXCLUDING EAR COVRS SUPPORTED BY SAID HEADBAND TO ENCLOSE THE OUTER EARS OF THE WEARER; MICROPHONE MEANS RESPONSIVE TO SOUNDS ORIGINATING EXTERIORLY OF SAID EAR COVERS; SOUND REPRODUCING TRANSDUCER MEANS RESPONSIVE TO SAID MICROPHONE MEANS TO REPRODUCE SOUNDS PICKED UP BY SAID MICROPHONE MEANS INTERIORLY OF AT LEAST ONE OF SAID EAR COVERS, A LIMITING AMPLIFIER TO CONTROL SAID REPRODUCED SOUNDS WITHIN A FINITE DYNAMIC RANGE, THE THE UPPER LIMIT OF WHICH IS BELOW THE DAMAGE RISK CRITERIA FOR HUMAN HEARING; MEANS ON THE EXTERNAL SURFACE OF ONE OF SAID PAIR OF EAR COVERS FOR MOUNTING SAID MICROPHONE MEANS; AND MEANS MOUNTING SAID REPRODUCING TRANSDUCER MEANS ON THE INTERIOR OF SAID ONE EAR COVER.
References Cited (Backward Citations)
US3124760A
Cited
US1087704A
Cited
US1182896A
Cited
US2946862A
Cited
US2946860A
Cited
US3098121A
Cited
US3160717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |