US3111187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm for electro acoustic transducer
Assignee: H J LEAK AND CO Ltd
•
Filing: 1959-11-23
•
Granted: 1963-11-19
•
Expires: 1979-11-23
Abstract
No abstract record available.
Inventors
- 👤 Barlow Donald Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; H04R7/125; H04R7/04; H04R7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A DIAPHRAGM FOR AN ELECTRO-ACOUSTIC TRANSDUCER WHICH COMPRISES A BODY OF SANDWICH CONSTRUCTION HAVING FIRST AND SECOND SKINS OF THIN SHEET METAL SPACED APART BY A DISTANCE AT LEAST ONE HUNDRED TIMES GREATER THAN THE THICKNESS OF EITHER OF SAID SKINS AND AN INTERMEDIATE CORE FILLING OF LOW-DENSITY MATERIAL IN THE SPACE BETWEEN THE OPPOSING INNER SURFACES OF SAID SKINS, SAID CORE MATERIAL BEING FIRMLY SECURED TO THE INNER SURFACES OF EACH OF SAID SKINS TO FORM A UNITARY STRUCTURE THEREWITH.
Claim 2
Dependent Claim
81 words
A DIAPHRAGM FOR AN ELECTRO-ACOUSTIC TRANSDUCER WHICH COMPRISES A BODY OF SANDWICH CONSTRUCTION HAVING FIRST AND SECOND SKINS OF THIN SHEET METAL SPACED APART BY A DISTANCE AT LEAST ONE HUNDRED TIMES GREATER THAN THE THICKNESS OF EITHER OF SAID SKINS AND AN INTERMEDIATE CORE FILLING OF LOW-DENSITY MATERIAL IN THE SPACE BETWEEN THE OPPOSING INNER SURFACES OF SAID SKINS, SAID CORE MATERIAL BEING FIRMLY SECURED TO THE INNER SURFACES OF EACH OF SAID SKINS TO FORM A UNITARY STRUCTURE THEREWITH.
References Cited (Backward Citations)
GB323539A
Cited
US1824664A
Cited
US2013792A
Cited
DE900228C
Cited
GB510707A
Cited
GB513289A
Cited
DE863084C
Cited
US2768235A
Cited
US2775653A
Cited
FR1059899A
Cited
US2744042A
Cited
US2905260A
Cited
US2926741A
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 |