US3150989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight refractory aggregate and process for making same
Assignee: Chicago Fire Brick Co
•
Filing: 1962-04-23
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Granted: 1964-09-29
•
Expires: 1982-04-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/10; C04B38/08; C04B38/106; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE PROCESS OF FORMING A LIGHTWEIGHT AGGREGATE WHEREIN A FOAM IS FORMED FROM AN AQUEOUS MIXTURE CONSISTING ESSENTIALLY OF WATER, PARTICLES OF REFRACTORY MATERIAL, A FOAMING AGENT, AND A GELLING AGENT, AND THE FOAM FIRED TO FORM A REFRACTORY AGGREGATE; THE IMPROVEMENT CONSISTING OF HEATING THE FOAM HAVING THEREIN A THERMAL GELLING AGENT FROM THE GROUP CONSISTING OF METHYL CELLULOSE AND RAW STARCH TO FORM A GEL, AND FIRING THE GELLED MASS.
Claim 2
Dependent Claim
10 words
A LIGHTWEIGHT AGGREGATE OBTAINED BY THE PROCESS OF CLAIM 21.
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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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |