Patent US2956893A successfully refreshed from Google Patents.
US2956893A
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: 1960-10-18
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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
2026-10-31 06:41
CPC Classifications
C; C04; C04B; C04B32/00; C04B32/005; C03; C03C; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A THERMAL INSULATING MATERIAL CAPABLE OF WITHSTANDING TEMPERATURES UP TO ABOUT 1600*F. WITHOUT SUBSTANTIAL DETERIORATION, CONSISTING ESSENTIALLY OF UNFRAGMENTED EXPANDED PERLITE AND BENTONITE FIRMLY BOUND TOGETHER WITH AN INORGANIC GLASS SELECTED FROM THE GROUP CONSISTING OF BORON-CONTAINING GLASS, PHOSPHATE-CONTAINING GLASS AND MIXTURES THEREOF, SAID PERLITE COMPRISING BETWEEN ABOUT 70 AND ABOUT 85%, SAID BENTONITE COMPRISING BETWEEN ABOUT 10 AND ABOUT 20%, AND SAID INORGAIC GLASS COMPRISING BETWEEN ABOUT 2 AND ABOUT 10% BY WEIGHT OF THE MATERIAL.
Claim 2
Dependent Claim
77 words
A THERMAL INSULATING MATERIAL CAPABLE OF WITHSTANDING TEMPERATURES UP TO ABOUT 1600*F. WITHOUT SUBSTANTIAL DETERIORATION, CONSISTING ESSENTIALLY OF UNFRAGMENTED EXPANDED PERLITE AND BENTONITE FIRMLY BOUND TOGETHER WITH AN INORGANIC GLASS SELECTED FROM THE GROUP CONSISTING OF BORON-CONTAINING GLASS, PHOSPHATE-CONTAINING GLASS AND MIXTURES THEREOF, SAID PERLITE COMPRISING BETWEEN ABOUT 70 AND ABOUT 85%, SAID BENTONITE COMPRISING BETWEEN ABOUT 10 AND ABOUT 20%, AND SAID INORGAIC GLASS COMPRISING BETWEEN ABOUT 2 AND ABOUT 10% BY WEIGHT OF THE 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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |