US3663933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective band for bilaminar transducer with slotted spacer ring
Assignee: United States Department of the Navy
•
Filing: 1970-07-02
•
Granted: 1972-05-16
•
Expires: 1990-07-02
Abstract
Abstract An improvement in bilaminar sonar transducers which employ slotted, compliant, outer spacer rings, the improvement comprising filling the slots with a plastic resin, such as epoxy resin, having a low modulus of elasticity as compared with that of the spacer ring, and banding the spacer ring with a wrapping of fiberglass tape which is impregnated with epoxy resin and cured.
Inventors
- 👤 Theodore C Madison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:54
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0644; B06B1/0662; B06B1/0677
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
In a bilaminar sonar disc transducer having a crystal backing assembly comprising a pair of metallic discs separated by a slotted metallic peripheral spacer ring, the improvement comprising: a filling for said slots from a material having a low modulus of elasticity compared to that of said slotted, metallic spacer ring; and a protective band wrapped around the outside of said spacer ring, said band comprising at least one layer of tape impregnated with a plastic resin, the density of said tape and resin being sufficiently low that the radial compliance of the combination is at least an order of magnitude below that of said slotted spacer ring.
Claim 2
Dependent Claim
108 words
In a bilaminar sonar disc transducer having a crystal backing assembly comprising a pair of metallic discs separated by a slotted metallic peripheral spacer ring, the improvement comprising: a filling for said slots from a material having a low modulus of elasticity compared to that of said slotted, metallic spacer ring; and a protective band wrapped around the outside of said spacer ring, said band comprising at least one layer of tape impregnated with a plastic resin, the density of said tape and resin being sufficiently low that the radial compliance of the combination is at least an order of magnitude below that of said slotted spacer ring.
Claim 3
Dependent Claim
14 words
A transducer as in claim 1, in which said tape is fiber glass tape.
Claim 4
Dependent Claim
17 words
A transducer as in claim 1, in which said filling and said tape-impregnating materials are epoxy resins.
Claim 5
Dependent Claim
23 words
A transducer as in claim 1, in which said tape is fiber glass tape, and said filling and tape-impregnating materials are plastic resin.
Claim 6
Dependent Claim
23 words
A transducer as in claim 1, in which said tape is fiber glass tape, and said filling and tape-impregnating material are epoxy resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |