US2501698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal expansion and vesiculation process for siliceous materials
Assignee: GREAT LAKES CARBON Corp
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Filing: 1947-06-05
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Granted: 1950-03-28
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Expires: 1967-06-05
Abstract
No abstract record available.
Inventors
- 👤 Stecker Glenroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:25
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR EXPANDING AN EXPANDABLE VOLCANIC GLASS WHICH COMPRISES RAPIDLY HEATING SAID GLASS TO ABOUT 900* TO ABOUT 1200*C. FOR A TIME SUFFICIENT TO EXPAND SAID GLASS AND PRODUCE A MAXIUM OF SEALED VOIDS, THE TIME FOR EXPANDING BEING LESS THAN FOUR MINUTES, RAPIDLY COOLING THE EXPANDED PARTICLES TO A TEMPERATURE OF 650* TO 1000*C. BUT IN ANY EVENT AT LEAST 50* BELOW THE EXPANSION TEMPERATURE MAINTAINING IT AT SAID TEMPERATURE FOR AT LEAST ONE MINUTE TO TEMPER THE PARTICLES THROUGHOUT, THEREBY RELIEVING STRAINS AND INCREASING STRENGTH WITHOUT SUBSTANTIAL REDUCTION IN SEALED VOID VOLUME.
Claim 2
Dependent Claim
95 words
A PROCESS FOR EXPANDING AN EXPANDABLE VOLCANIC GLASS WHICH COMPRISES RAPIDLY HEATING SAID GLASS TO ABOUT 900* TO ABOUT 1200*C. FOR A TIME SUFFICIENT TO EXPAND SAID GLASS AND PRODUCE A MAXIUM OF SEALED VOIDS, THE TIME FOR EXPANDING BEING LESS THAN FOUR MINUTES, RAPIDLY COOLING THE EXPANDED PARTICLES TO A TEMPERATURE OF 650* TO 1000*C. BUT IN ANY EVENT AT LEAST 50* BELOW THE EXPANSION TEMPERATURE MAINTAINING IT AT SAID TEMPERATURE FOR AT LEAST ONE MINUTE TO TEMPER THE PARTICLES THROUGHOUT, THEREBY RELIEVING STRAINS AND INCREASING STRENGTH WITHOUT SUBSTANTIAL REDUCTION IN SEALED VOID VOLUME.
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) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |