Patent US7037316B2 successfully refreshed from Google Patents.
US3598199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflector and method of making same
Assignee: Fried Krupp AG
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Filing: 1968-08-12
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Granted: 1971-08-10
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Expires: 1988-08-12
Abstract
Abstract Article for reflecting sound waves in water in which polyurethane foam is watertightly embedded in an outer casing formed of polyurethane casting resin embedding it in a casing of polyurethane casting resin. Method for producing such an article including heating the polyurethane foam to about 120* C.
Inventors
- 👤 Peter Mertens
- 👤 Ernst August Winkelholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:19
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/74; G10; G10K; G10K11/00; G10K11/18; G10K11/20; G10K11/205; Y; Y10; Y10S; Y10S273/00; Y10S273/08; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
Method for producing sound wave reflectors for use in water comprising the steps of: a. heating polyurethane foam to about 120* C; and b. encasing said heated polyurethane foam with polyurethane casting resin.
Claim 2
Dependent Claim
26 words
Method for producing sound wave reflectors as defined in claim 4 wherein said encasing material itself serves as a casing protecting said polyurethane foam from water.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |