US2956891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making porous products from volcanic glass and alumina
Assignee: Armstrong World Industries Inc
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Filing: 1959-03-09
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Granted: 1960-10-18
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Expires: 1979-03-09
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Booth
- 👤 Robert L Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/14; C04B14/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A METHOD OF MAKING A FOAMED AND EXPANDED VOLCANIC GLASS PRODUCT FROM A REGROUND POWDER FORMED OF FIRED, FLUXED, AND EXPANDED VOLCANIC GLASS HAVING CHEMICALLY AND PHYSICALLY COMBINED THEREIN A FLUXING AND GASSING AGENT, THE IMPROVEMENT WHICH COMPRISES ADDING TO SAID REGROUND POWDER FROM ABOUT 1% TO ABOUT 10%, BASED ON THE WEIGHT OF THE REGROUND POWDER OF ALUMINA IN FINELY DIVIDED FORM, REFIRING THE RESULTING BATCH WITHIN A TEMPERATURE RANGE OF ABOUT 1400*F. TO ABOUT 2000*F. TO FORM A FOAMED AND SUBSTANTIALLY EXPANDED PRODUCT, AND THEN ANNEALING THE PRODUCT.
Claim 2
Dependent Claim
91 words
IN A METHOD OF MAKING A FOAMED AND EXPANDED VOLCANIC GLASS PRODUCT FROM A REGROUND POWDER FORMED OF FIRED, FLUXED, AND EXPANDED VOLCANIC GLASS HAVING CHEMICALLY AND PHYSICALLY COMBINED THEREIN A FLUXING AND GASSING AGENT, THE IMPROVEMENT WHICH COMPRISES ADDING TO SAID REGROUND POWDER FROM ABOUT 1% TO ABOUT 10%, BASED ON THE WEIGHT OF THE REGROUND POWDER OF ALUMINA IN FINELY DIVIDED FORM, REFIRING THE RESULTING BATCH WITHIN A TEMPERATURE RANGE OF ABOUT 1400*F. TO ABOUT 2000*F. TO FORM A FOAMED AND SUBSTANTIALLY EXPANDED PRODUCT, AND THEN ANNEALING THE PRODUCT.
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |