US2977240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improving the light reflectance of expanded perlite material
Assignee: International Minerals and Chemical Corp
•
Filing: 1956-10-19
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Granted: 1961-03-28
•
Expires: 1976-10-19
Abstract
No abstract record available.
Inventors
- 👤 Harry H Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE PROCESS OF PREPARING A PERLITE COMPOSITION OF IMPROVED LIGHT REFLECTING PROPERTIES WHICH COMPRISES MIXING GROUND UNEXPANDED PERLITE MATERIAL WITH A WHITE REFRACTORY OXYGEN-CONTAINING SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF TITANIUM OXIDE, MAGNESIUM OXIDE, MAGNESIUM CARBONATE, ZIRCONIUM OXIDE, AND DICALCIUM PHOSPHATE, AND HEATING THE MIXTURE TO TEMPERATURES IN THE RANGE BETWEEN ABOUT 1500* AND ABOUT 2100*F. TO CAUSE EXPANSION OF THE PARTICLES.
Claim 2
Dependent Claim
63 words
THE PROCESS OF PREPARING A PERLITE COMPOSITION OF IMPROVED LIGHT REFLECTING PROPERTIES WHICH COMPRISES MIXING GROUND UNEXPANDED PERLITE MATERIAL WITH A WHITE REFRACTORY OXYGEN-CONTAINING SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF TITANIUM OXIDE, MAGNESIUM OXIDE, MAGNESIUM CARBONATE, ZIRCONIUM OXIDE, AND DICALCIUM PHOSPHATE, AND HEATING THE MIXTURE TO TEMPERATURES IN THE RANGE BETWEEN ABOUT 1500* AND ABOUT 2100*F. TO CAUSE EXPANSION OF THE PARTICLES.
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |