US2621160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for expanding perlitic minerals
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1948-05-24
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Granted: 1952-12-09
•
Expires: 1968-05-24
Abstract
No abstract record available.
Inventors
- 👤 Wilbur E Johnson
- 👤 Reintjes Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:48
CPC Classifications
B; B03; B03B; B03B1/00; B03B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR VESICULATING AN EXPANDABLE VOLCANIC GLASS SUBJECT TO DECREPITATION WHEN SUDDENLY SUBJECTED TO AN EXPANSION TEMPERATURE, WHICH COMPRISES INTRODUCING PARTICLES OF SAID GLASS INTO AN EXPANSION ZONE OUT OF CONTACT WITH FLAME, MAINTAINING THE PARTICLES IN ROTATION AS A FLOWING STREAM, SAID STREAM BEING IN CONTACT WITH A SURFACE MAINTAINED AT A VESICULATION TEMPERATURE, PASSING A FLAME AS THE SOLE MEANS OF SUPPLYING HEAT INTO SAID ZONE OUT OF DIRECT CONTACT WITH SAID STREAM AT ALL TIMES, DIRECTING SAID FLAME AGAINST A SURFACE APPROXIMATELY DIAMETRICALLY OPPOSITE THE FLOWING STREAM TO HEAT SAID SURFACE
Claim 2
Dependent Claim
95 words
A PROCESS FOR VESICULATING AN EXPANDABLE VOLCANIC GLASS SUBJECT TO DECREPITATION WHEN SUDDENLY SUBJECTED TO AN EXPANSION TEMPERATURE, WHICH COMPRISES INTRODUCING PARTICLES OF SAID GLASS INTO AN EXPANSION ZONE OUT OF CONTACT WITH FLAME, MAINTAINING THE PARTICLES IN ROTATION AS A FLOWING STREAM, SAID STREAM BEING IN CONTACT WITH A SURFACE MAINTAINED AT A VESICULATION TEMPERATURE, PASSING A FLAME AS THE SOLE MEANS OF SUPPLYING HEAT INTO SAID ZONE OUT OF DIRECT CONTACT WITH SAID STREAM AT ALL TIMES, DIRECTING SAID FLAME AGAINST A SURFACE APPROXIMATELY DIAMETRICALLY OPPOSITE THE FLOWING STREAM TO HEAT SAID SURFACE
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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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |