Patent US3111189A successfully refreshed from Google Patents.
US3111189A
Expired / Lapsed
US
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Electrodynamic loudspeaker
Assignee: Individual
•
Filing: 1962-01-12
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Granted: 1963-11-19
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Expires: 1982-01-12
Abstract
No abstract record available.
Inventors
- 👤 Theodore R Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:15
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
AN ELECTRODYNAMIC LOUDSPEAKER HAVING AN OPEN DIAPHRAGM FACE SLOPING FROM A SINGLE APEX TO A PLANAR EDGE OF SUBSTANTIALLY VIOL SHAPE.
Claim 2
Dependent Claim
21 words
AN ELECTRODYNAMIC LOUDSPEAKER HAVING AN OPEN DIAPHRAGM FACE SLOPING FROM A SINGLE APEX TO A PLANAR EDGE OF SUBSTANTIALLY VIOL SHAPE.
References Cited (Backward Citations)
GB176098A
Cited
US1689136A
Cited
US2146975A
Cited
US2549091A
Cited
US2717047A
Cited
US3026958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-18 | 1967-05-20 | 1967-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-18 | 1971-05-20 | 1971-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-18 | 1975-05-20 | 1975-11-19 | $7700.00 | Window Closed / Lapsed |