US2675322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Investment material
Assignee: Pre-Vest Inc
•
Filing: 1951-06-20
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Granted: 1954-04-13
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Expires: 1971-06-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Claude H Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:18
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A MATERIAL CAPABLE OF BEING MIXED WITH WATER TO FORM AN EMBEDDING MASS, SAID MATERIAL CONSISTING OF SILICA IN A RANGE OF SUBSTANTIALLY 80% TO 90% OF THE TOTAL DRY COMPOSITION AND THE REMAINDER OF BONDING INGREDIENTS, THE TOTAL OF SAID SILICA BEING APPROXIMATELY 50 TO 80% IN GRANULAR FORM LARGER THAN APPROXIMATELY 60 MESH AND THE REMAINDER IN POWDERED FORM SMALLER THAN 60 MESH, SAID BONDING INGREDIENTS COMPRISING APPROXIMATELY 5 TO 9.5% FUSED MAGNESIUM OXIDE POWDER, APPROXIMATELY 4 TO 6% MONO AMMONIUM PHOSPHATE POWDER, AND APPROXIMATELY 11/2 TO 4% MONO MAGNESIUM PHOSPHATE POWDER, SAID MASS HAVING A COMPRESSION STRENGTH AFTER SETTING 24 HOURS AT ROOM TEMPERATURE IN THE NEIGHBORHOOD OF 70 DEGREES F. OF NOT LESS THAN 500 POUNDS PER SQUARE INCH AND HAVING A FIRED COMPRESSION STRENGTH OF NOT MORE THAN 200 POUNDS PER SQUARE INCH.
Claim 2
Dependent Claim
138 words
A MATERIAL CAPABLE OF BEING MIXED WITH WATER TO FORM AN EMBEDDING MASS, SAID MATERIAL CONSISTING OF SILICA IN A RANGE OF SUBSTANTIALLY 80% TO 90% OF THE TOTAL DRY COMPOSITION AND THE REMAINDER OF BONDING INGREDIENTS, THE TOTAL OF SAID SILICA BEING APPROXIMATELY 50 TO 80% IN GRANULAR FORM LARGER THAN APPROXIMATELY 60 MESH AND THE REMAINDER IN POWDERED FORM SMALLER THAN 60 MESH, SAID BONDING INGREDIENTS COMPRISING APPROXIMATELY 5 TO 9.5% FUSED MAGNESIUM OXIDE POWDER, APPROXIMATELY 4 TO 6% MONO AMMONIUM PHOSPHATE POWDER, AND APPROXIMATELY 11/2 TO 4% MONO MAGNESIUM PHOSPHATE POWDER, SAID MASS HAVING A COMPRESSION STRENGTH AFTER SETTING 24 HOURS AT ROOM TEMPERATURE IN THE NEIGHBORHOOD OF 70 DEGREES F. OF NOT LESS THAN 500 POUNDS PER SQUARE INCH AND HAVING A FIRED COMPRESSION STRENGTH OF NOT MORE THAN 200 POUNDS PER SQUARE INCH.
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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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |