US3588358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for testing hearing
Assignee: Bankers Trust Co
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Filing: 1968-08-29
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Granted: 1971-06-28
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Expires: 1988-08-29
Abstract
Abstract THIS INVENTION PERTAINS TO A METHOD OF TESTING HEARING EMPLOYING A WARBLED SOUND WHICH MAY BE SET AT EACH OF A PLURALITY OF CONSTANT AMPLITUDE LEVELS. APPARATUS ESPECIALLY ADAPTED FOR USE IN SUCH A METHOD IS PORTABLE WITH A SELF-CONTAINED BATTERY AND HAVING ELECTRONIC COMPONENTS FOR GENERATING AND MODULATING AN ELECTRICAL SIGNAL WHICH IS IMPRESSED ON A TRANSDUCER MEANS. THE RESULTANT SIGNAL MAY BE EITHER FREQUENCY MODULATED ABOUT A CENTER FREQUENCY WITHIN THE AUDIBLE RANGE OF THE TESTED SUBJECT OR MAY BE A CONSTANT FREQUENCY SIGNAL WITHIN SUCH AN AUDIBLE RANGE, AMPLITUDE MODULATED IN SUCH A MANNER TO SIMULATE THE WARBLING OF A FREQUENCY MODULATED SIGNAL.
Inventors
- 👤 H Wayne Rudmose
- 👤 Nelson N Estes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/12; A61B2560/00; A61B2560/04; A61B2560/0406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |