US3582377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam curable composition and method
Assignee: University of Minnesota Twin Cities
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Filing: 1967-11-24
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Granted: 1971-06-01
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Expires: 1987-11-24
Abstract
Abstract AN IMPROVED COMPOSITION FOR AND METHOD OF MAKING PRECAST AUTOCLAVE-CURED MASONRY ARTICLES BASED UPON THE DISCOVERY THAT PART OR ALL OF THE PARTLAND CEMENT AND/OR SILICA FLOUR HERETOFORE USED MAY BE REPLACED BY ABUNDANT NATURAL WASTE CALCAREOUS NON-CEMENT SUBSTANCES AND MIXTURES THEROF GROUND TO CEMENT FINENESS. SLAGS, LIME, LIMESTONE AND DOLOMITE ARE EXEMPLAY OF READILY AVAILABLE REPLACEMENT MATERIALS.
Inventors
- 👤 Ronald M Hays
- 👤 Iwao Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:45
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B28/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |