Patent US1855991A successfully refreshed from Google Patents.
US2958623A
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Method of molding a low density high strength shaped body from a dilute slurry
Assignee: Individual
•
Filing: 1955-06-30
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Granted: 1960-11-01
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Expires: 1975-06-30
Abstract
No abstract record available.
Inventors
- 👤 Norman P Harshberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/40; B28B7/46; B28B1/00; B28B1/52; B28B3/00; B28B3/003; B28B7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD OF FORMING A LOW DENSITY HIGH STRENGTH SHAPED BODY COMPRISING THE STEPS OF MAKING A DILUTE SLURRY COMPOSED OF 5 TO 30% ASBESTOS FIBER, 5 TO 35% LIGHT-WEIGHT INORGANIC FILLER, 55 TO 85% HYDRAULIC CEMENT, AND 15 TO 20 PARTS OF WATER TO THE SOLIDS, AGITATING THE SLURRY IN A POROUS MOLD AND IMMEDIATELY APPLY ING A VACUUM TO THE MOLD AND DRAWING WATER FROM THE SLURRY TO FORM A SHAPED BODY IN THE MOLD BEFORE THE SOLIDS MIGRATE FROM THEIR DISPERSED STATE, APPLYING PRESSURE TO THE BODY FORMED IN THE MOLD WHILE CONTINUING THE VACUUM, RELEASING THE VACUUM AND APPLYING FURTHER PRESSURE TO SAID BODY, RELEASING THE VACUUM AND THE PRESSURE AND WITHDRAWING THE BODY FROM THE MOLD, AND CURING SAID BODY AT ATMOSPHERIC-TEMPERATURE AND PRESSURE.
Claim 2
Independent Claim
129 words
A METHOD OF FORMING A LOW DENSITY HIGH STRENGTH SHAPED BODY COMPRISING THE STEPS OF MAKING A DILUTE SLURRY COMPOSED OF 5 TO 30% ASBESTOS FIBER, 5 TO 35% LIGHT-WEIGHT INORGANIC FILLER, 55 TO 85% HYDRAULIC CEMENT, AND 15 TO 20 PARTS OF WATER TO THE SOLIDS, AGITATING THE SLURRY IN A POROUS MOLD AND IMMEDIATELY APPLY ING A VACUUM TO THE MOLD AND DRAWING WATER FROM THE SLURRY TO FORM A SHAPED BODY IN THE MOLD BEFORE THE SOLIDS MIGRATE FROM THEIR DISPERSED STATE, APPLYING PRESSURE TO THE BODY FORMED IN THE MOLD WHILE CONTINUING THE VACUUM, RELEASING THE VACUUM AND APPLYING FURTHER PRESSURE TO SAID BODY, RELEASING THE VACUUM AND THE PRESSURE AND WITHDRAWING THE BODY FROM THE MOLD, AND CURING SAID BODY AT ATMOSPHERIC-TEMPERATURE AND PRESSURE.
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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) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |