US3657181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustically transparent composition comprising a thermoplastic polymer and organic fluorine containing compound
Assignee: 3M Co
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Filing: 1969-08-04
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Granted: 1972-04-18
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Expires: 1989-08-04
Abstract
Abstract A MATERIAL HAVING ACOUSTIC TRANSPARENCY USEFUL AS A SONAR WINDOW OR LENS COMPRISING A HOMOGENEOUS MIXTURE OF A THERMOPLASTIC MATERIAL AND AN ORGANIC FLUORINE-CONTAINING MATERIAL. THE THEMEROPLASTIC MATERIAL HAS A DENSITY NOT GREATER THAN 1.5 AND A SOUND TRANSMISSION VELOCITY NOT GREATER THAN 2.0X10**5 CENTIMETERS PER SECOND, BUT GREATER THAN THE VELOCITY OF SOUND IN WATER. THE ORGANIC FLUORINE-CONTAINING MATERIAL HAS A DENSITY GREATER THAN ABOUT 1.5 AND VELOCITY OF SOUND TRANSMISSION LESS THAN WATER. THE FLUORINE-CONTAINING MATERIAL CONTAINS NOT MORE THAN 65% BY WEIGHT OF FLUORINE.
Inventors
- 👤 Richard G Riedesel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/30; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L31/00; C08L31/02; C08L31/04; C08L57/00; C08L57/06; C08L57/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |