US3687697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glasses for temperature-stable ultrasonic delay lines of low damping characteristics
Assignee: Schott AG
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Filing: 1970-06-22
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Granted: 1972-08-29
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Expires: 1990-06-22
Abstract
Abstract GLASS COMPOSITIONS FOR USE IN DELAY LINE ASSEMBLIES HAVING LOW TEMPERATURE COEFFICIENT OF PROPAGATION TIME FOR ULTRASONIC WAVES, LOW MECHANICAL DAMPING, A TRANSFORMATION TEMPERATURE OF ABOUT 540-600*C. AND HIGH ACCOUSTICAL IMPEDANCE. PREFERRED COMPOSITIONS IN PERCENT BY WEIGHT ARE AS FOLLOWS: SIO2 48.5-49.7 LI2O 0-0.2 NA2O 0-0.6 K20 0.7-1.0 BAO 10.5-11.5 ZNO 3.1-5.8 PHO 3.1-34 SB2O3 0.3-0.5 THE TOTAL ALKALI METAL OXIDE AMOUNTING TO 0.7-1.8%, WITH THE PROVISO THAT UP TO 2 OF THE WT. PERCENT OF BAO MAY BE REPLACED BY CDO, SRO, CAO, WO3, AL2O2, OR A MIXTURE OF TWO OR MORE THEREOF, FOR STABILIZATION AGAINST DEVITRIFICATION.
Inventors
- 👤 Marga Faulstich
- 👤 Norbert Neuroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:05
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0057; C03C3/00; C03C3/04; C03C3/076; C03C3/102; C03C3/105
Claims Analysis
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |