US2987411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight aggregate and method of making same
Assignee: CONVERSION SYSTEMS OF PENNSYLVANIA Inc
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Filing: 1957-11-19
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Granted: 1961-06-06
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Expires: 1977-11-19
Abstract
No abstract record available.
Inventors
- 👤 Minnick Leonard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/02; C04B18/027; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S264/00; Y10S264/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF PREPARING A LIGHT-WEIGHT CELLULAR COMPOSITION WHICH COMPRISES FIRING IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN ABOUT 1500* AND ABOUT 2400*F., A MOLDABLE MIXTURE OF FLY ASH, A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CLAY, SHALE AND MIXTURES THEREOF, AND WATER, SAID FLY ASH BEING PRESENT IN SAID MIXTURE IN AN AMOUNT BETWEEN ABOUT 5% AND ABOUT 90%, BY WEIGHT, BASED ON THE COMBINED WEIGHT OF SOLID MATERIALS.
Claim 2
Independent Claim
73 words
THE METHOD OF PREPARING A LIGHT-WEIGHT CELLULAR COMPOSITION WHICH COMPRISES FIRING IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN ABOUT 1500* AND ABOUT 2400*F., A MOLDABLE MIXTURE OF FLY ASH, A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CLAY, SHALE AND MIXTURES THEREOF, AND WATER, SAID FLY ASH BEING PRESENT IN SAID MIXTURE IN AN AMOUNT BETWEEN ABOUT 5% AND ABOUT 90%, BY WEIGHT, BASED ON THE COMBINED WEIGHT OF SOLID MATERIALS.
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |