US2853394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious composition
Assignee: United States Gypsum Co
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Filing: 1953-03-30
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Granted: 1958-09-23
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Expires: 1973-03-30
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Riddell
- 👤 George B Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:05
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/20; C04B2111/28; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249932
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A SET, DENSE CEMENTITIOUS COMPOSITION CHARACTERIZED BY A FIRE-RESISTANCE RATING OF AT LEAST 60 MINUTES WHICH CONSISTS ESSENTIALLY OF A SET MASS OF INTERLACED GYPSUM CRYSTALS AND IN INTIMATE ADMXTURE THEREWITH FROM 1% TO 5% EXPANDE PERLITE HAVING A BULK DENSITY OF FROM 5 TO 15 LBS. PER CUBIC FOOT AND OF PARTICLE SIZE SUBSTANTIALLY ENTIERELY LESS THAN 2.38 MM. DIAMETER AND OF AT LEAST 149 MICRONS DIAMETER, FROM 0.2% RO 0.5% OF VITEROUS CERAMIC FIBERS HAVING A LENGTH OF FRO, 0.5 TO 3.0 INCH AND AN AVERAGE DIAMETER OF FROM 0.00015 TO 0.0006 INCH, SAID COMPOSITION NOT OVER 0.5% ORGANIC FIBROUS MATERIAL.
Claim 2
Dependent Claim
103 words
A SET, DENSE CEMENTITIOUS COMPOSITION CHARACTERIZED BY A FIRE-RESISTANCE RATING OF AT LEAST 60 MINUTES WHICH CONSISTS ESSENTIALLY OF A SET MASS OF INTERLACED GYPSUM CRYSTALS AND IN INTIMATE ADMXTURE THEREWITH FROM 1% TO 5% EXPANDE PERLITE HAVING A BULK DENSITY OF FROM 5 TO 15 LBS. PER CUBIC FOOT AND OF PARTICLE SIZE SUBSTANTIALLY ENTIERELY LESS THAN 2.38 MM. DIAMETER AND OF AT LEAST 149 MICRONS DIAMETER, FROM 0.2% RO 0.5% OF VITEROUS CERAMIC FIBERS HAVING A LENGTH OF FRO, 0.5 TO 3.0 INCH AND AN AVERAGE DIAMETER OF FROM 0.00015 TO 0.0006 INCH, SAID COMPOSITION NOT OVER 0.5% ORGANIC FIBROUS MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |