Patent US2878131A successfully refreshed from Google Patents.
US2878131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perlite insulation material
Assignee: International Minerals and Chemical Corp
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Filing: 1957-10-28
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Granted: 1959-03-17
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Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Harry H Houston
- 👤 Louis S Mccollum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:45
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/10; C04B28/105; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A THERMAL INSULATING MATERIAL CAPABLE OF WITHSTANDING TEMPERATURES UP TO ABOUT 1400*F. WITHOUT SUBSTANTIAL DETERIORATION COMPRISED ESSENTIALLY OF A MIXTURE OF EXPANDED PERLITE, BASIC MAGNESIUM CARBONATE, ASBESTOS AND ACTIVATED CLAY, SAID PERLITE COMPRISING BETWEEN ABOUT 20% AND ABOUT 55% BY WEIGHT, SAID CARBONATE COMPRISING BETWEEN ABOUT 30% AND ABOUT 65% BY WEIGHT, SAID ASBESTOS COMPRISING BETWEEN ABOUT 10% AND ABOUT 17% BY WEIGHT, AND SAID CLAY COMPRISING BETWEEN ABOUT 3% AND ABOUT 10% BY WEIGHT OF SAID MATERIAL.
Claim 2
Dependent Claim
78 words
A THERMAL INSULATING MATERIAL CAPABLE OF WITHSTANDING TEMPERATURES UP TO ABOUT 1400*F. WITHOUT SUBSTANTIAL DETERIORATION COMPRISED ESSENTIALLY OF A MIXTURE OF EXPANDED PERLITE, BASIC MAGNESIUM CARBONATE, ASBESTOS AND ACTIVATED CLAY, SAID PERLITE COMPRISING BETWEEN ABOUT 20% AND ABOUT 55% BY WEIGHT, SAID CARBONATE COMPRISING BETWEEN ABOUT 30% AND ABOUT 65% BY WEIGHT, SAID ASBESTOS COMPRISING BETWEEN ABOUT 10% AND ABOUT 17% BY WEIGHT, AND SAID CLAY COMPRISING BETWEEN ABOUT 3% AND ABOUT 10% BY WEIGHT OF SAID MATERIAL.
References Cited (Backward Citations)
US1279975A
Cited
US2634207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |