Patent US4231018A successfully refreshed from Google Patents.
Patent US2625512A successfully refreshed from Google Patents.
US2625512A
Expired / Lapsed
US
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Expanded perlite insulation and method of manufacture
Assignee: Johns Manville Corp
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Filing: 1948-04-29
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Granted: 1953-01-13
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Expires: 1968-04-29
Abstract
No abstract record available.
Inventors
- 👤 Edward R Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:36
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/068; C04B18/00; C04B18/02; C04B18/027; C04B30/00; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02; Y10S264/00; Y10S264/49
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A PROCESS OF MANUFACTURING LOOSE FILL INSULATION MATERIAL WHICH COMPRISES, FLASH HEAT EXPANDING FINELY DIVIDED PERLITE WHILE DISPERSED IN HOT GAS SUSPENSION, PARTIALLY COOLING THE GAS SUSPENSION OF HEAT EXPANDED PARTICLES AND MIXING THEREWITH A FOG DISPERSION OF WATER REPELLENT BITUMINOUS HIGH MELTING POINT BINDER WHEREBY FINE FILMS OF THE BINDER MATERIAL ARE DEPOSITED ON THE SURFACES OF THE PERLITE PARTICLES, AND AGITATING AND FURTHER COOLING THE GAS SUSPENSION TO AGGLOMERATE THE PARTICLES AND TO SOLIDIFY THE BINDER FILMS.
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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) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |