Patent US3857713A successfully refreshed from Google Patents.
US3857713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali free lead silicate glass medium for ultrasonic delay lines
Assignee: Labor Of Nippon Telegraphy & Telephone Public Corp ja
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Filing: 1972-06-19
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Granted: 1974-12-31
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Expires: 1992-06-19
Abstract
Abstract A glass medium suitable for ultrasonic delay lines employs a composition which consists essentially of 36 to 46 percent of SiO2, 35 to 60 percent of PbO, 0 to 20 percent of AlF3 and 0 to 10 percent of BaF2, the total content of the AlF3 and BaF2 being present in a range of 2 to 20 percent, the percentage being by weight.
Inventors
- 👤 T Inamura
- 👤 K Sawamoto
- 👤 Y Nakata
- 👤 N Niizeki
- 👤 M Tsunekawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:28
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/062; C03C3/07; C03C3/112; C03C4/00; C03C4/0057
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A GLASS MEDIUM FOR ULTRASONIC LINE HAVING THE RANGE OF -5 TO +5 PPM/*C OF THE TEMPRATURE COEFFICIENT OF THE TEMPERATURE COE ATTENUATION OF LESS THAN APPROXIMATELY 10X10**-3 DB/CYCLE AT A FREQUENCY HIGHER THAN 1 MH2, AND AGING OF DELAY TIME OF LESS THAN 50 PPM, THE GLASS MEDIUM BEING DEVOID OF AN ALKALI ION AND CONSISTING ESSENTIALLY OF, BY WEIGHT, 36 TO 46 PERCENT OF SIO2, 35 TO 60 PERCENT OF PBO, 0 TO 20 PERCENT OF ALF3 AND 0 -10 PERCENT OF BAF2, THE TOTAL CONTENT OF THE ALF3 AND BAF2 BEING PERSENT IN A RANGE OF 2 TO 20 PERCENT
Claim 2
Dependent Claim
103 words
A GLASS MEDIUM FOR ULTRASONIC LINE HAVING THE RANGE OF -5 TO +5 PPM/*C OF THE TEMPRATURE COEFFICIENT OF THE TEMPERATURE COE ATTENUATION OF LESS THAN APPROXIMATELY 10X10**-3 DB/CYCLE AT A FREQUENCY HIGHER THAN 1 MH2, AND AGING OF DELAY TIME OF LESS THAN 50 PPM, THE GLASS MEDIUM BEING DEVOID OF AN ALKALI ION AND CONSISTING ESSENTIALLY OF, BY WEIGHT, 36 TO 46 PERCENT OF SIO2, 35 TO 60 PERCENT OF PBO, 0 TO 20 PERCENT OF ALF3 AND 0 -10 PERCENT OF BAF2, THE TOTAL CONTENT OF THE ALF3 AND BAF2 BEING PERSENT IN A RANGE OF 2 TO 20 PERCENT
Claim 3
Dependent Claim
37 words
A glass medium according to claim 1 wherein the SiO2 is in the amount of 40.0 percent, the PbO is in the amount of 56.0 pErcent, and the fluoride is AlF3 in the amount of 4.0 percent.
Claim 4
Dependent Claim
37 words
A glass medium according to claim 1, wherein the SiO2 is in the amount of 40.0 percent, the PbO is in the amount of 53.5 percent, and the fluoride is AlF3 in the amount of 6.5 percent.
Claim 5
Dependent Claim
37 words
A glass medium according to claim 1 wherein the SiO2 is in the amount of 41.0 percent, the PbO is in the amount of 50.5 percent, and the fluoride is BaF2 in the amount of 8.5 percent.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |