Patent US3141071A successfully refreshed from Google Patents.
US3141071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full range electroacoustic transducers
Assignee: Individual
•
Filing: 1960-07-18
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Granted: 1964-07-14
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 Stanley R Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:44
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
ELECTRODYNAMIC TRANSDUCER COMPRISING MEANS TO ESTABLISH A SUBSTANTIALLY TIME-CONSTANT SHEET-FORM FIELD OF MAGNETIC FLUX EXTENDING OVER A PRESCRIBED AREA, SAID FLUX MEANS COMPRISING FIRST POLE MEANS LOCATED SUBSTANTIALLY ADJACENT A MID-REGION OF SAID AREA AND SECOND POLE MEANS LOCATED SUBSTANTIALLY ADJACENT AT LEAST A PORTION OF THE PERIPHERY OF SAID AREA, THE LINES OF FORCE OF SAID FIELD EXTENDING BETWEEN SAID FIRST AND SECOND POLE MEANS IN LIKE SENSE FROM THE PERIPHERY TO SAID MID-REGION, THE AREA OF SAID FIRST POLE MEANS CONFRONTING SAID FIRST-NAMED AREA BEING A MINOR FRACTION OF SAID FIRST-NAMED AREA, A SUBSTANTIALLY IMPERFORATE MEMBRANE COATED ON ONE SIDE
Claim 2
Dependent Claim
102 words
ELECTRODYNAMIC TRANSDUCER COMPRISING MEANS TO ESTABLISH A SUBSTANTIALLY TIME-CONSTANT SHEET-FORM FIELD OF MAGNETIC FLUX EXTENDING OVER A PRESCRIBED AREA, SAID FLUX MEANS COMPRISING FIRST POLE MEANS LOCATED SUBSTANTIALLY ADJACENT A MID-REGION OF SAID AREA AND SECOND POLE MEANS LOCATED SUBSTANTIALLY ADJACENT AT LEAST A PORTION OF THE PERIPHERY OF SAID AREA, THE LINES OF FORCE OF SAID FIELD EXTENDING BETWEEN SAID FIRST AND SECOND POLE MEANS IN LIKE SENSE FROM THE PERIPHERY TO SAID MID-REGION, THE AREA OF SAID FIRST POLE MEANS CONFRONTING SAID FIRST-NAMED AREA BEING A MINOR FRACTION OF SAID FIRST-NAMED AREA, A SUBSTANTIALLY IMPERFORATE MEMBRANE COATED ON ONE SIDE
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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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |