US3247927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducers
Assignee: International Standard Electric Corp
•
Filing: 1961-07-27
•
Granted: 1966-04-26
•
Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Cragg William Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:33
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10; H04R9/00; H04R9/02; H04R9/04; H04R9/045; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A METALLICALLY COATED MATERIAL FOR USE AS THE MEMBRANE DIAPHRAGM OF AN ELECTRO-ACOUSTIC TRANSDUCER COMPRISING A THIN SHEET OF HEAT SHRINKABLE THERMO-PLASTIC MATERIAL PRESTRECTHED UNIFORMLY IN AT LEAST TWO DIRECTIONS UNDER HEAT AND SET TO MAINTAIN STRAINS ESTABLISHED IN THE MATERIAL, AND A METALLIC FILM INTIMATELY AND UNIFORMLY COATED ON A SURFACE OF SAID MATERIAL, SAID METALLIC FILM AND SAID MATERIAL HAVING MISCORSOPIC CORRUGATIONS DISPOSED THEREIN DUE TO THE RELEASE OF STRAINS PREVIOUSLY IMPARTED TO SAID THERMO-PLASTIC MATERIAL.
Claim 2
Dependent Claim
78 words
A METALLICALLY COATED MATERIAL FOR USE AS THE MEMBRANE DIAPHRAGM OF AN ELECTRO-ACOUSTIC TRANSDUCER COMPRISING A THIN SHEET OF HEAT SHRINKABLE THERMO-PLASTIC MATERIAL PRESTRECTHED UNIFORMLY IN AT LEAST TWO DIRECTIONS UNDER HEAT AND SET TO MAINTAIN STRAINS ESTABLISHED IN THE MATERIAL, AND A METALLIC FILM INTIMATELY AND UNIFORMLY COATED ON A SURFACE OF SAID MATERIAL, SAID METALLIC FILM AND SAID MATERIAL HAVING MISCORSOPIC CORRUGATIONS DISPOSED THEREIN DUE TO THE RELEASE OF STRAINS PREVIOUSLY IMPARTED TO SAID THERMO-PLASTIC MATERIAL.
Claim 3
Dependent Claim
28 words
A METALLICALLY COATED MATERIAL FOR USE IN ELECTROACOUSTIC TRANSDUCERS ACCORDING TO CLAIM 1 FURTHER COMPRISING A CONVEX DOME POSITIONED CENTRALLY IN ONE FACE OF SAID METALLIC COATED MATERIAL.
References Cited (Backward Citations)
US2297218A
Cited
US2740732A
Cited
US2836528A
Cited
US2968583A
Cited
US2993558A
Cited
US3014818A
Cited
US2928132A
Cited
US3076520A
Cited
US3076062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |