US3591393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating fire brick
Assignee: Johns Manville Corp
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Filing: 1968-11-04
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Granted: 1971-07-06
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Expires: 1988-11-04
Abstract
Abstract A LIGHTWEIGHT INSULATING FRACTORY COMPOSITION, OR BRICK THEREOF, OF IMPROVED STRENGTH CHARACTERISTICS FOR HIGH TEMPERATURES SERVICE COMPRISING THE FIRED PRODUCT OF KAOLIN CLAY, PYROPHYLLITE, GROG, AND SAWDUST, CONTAINING THEREIN PARTICULATE PRE-FIRED MIXTURE OF GYPSUM AND KAOLIN.
Inventors
- 👤 Adam Smith Rankine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:53
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |