US2543987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing porous, lightweight, burned argillaceous material
Assignee: Stark Ceramics Inc
•
Filing: 1947-08-23
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Granted: 1951-03-06
•
Expires: 1967-08-23
Abstract
No abstract record available.
Inventors
- 👤 William S Ramsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF PRODUCING AN EXPANDED, POROUS, LIGHT-WEIGHT BURNED ARGILLACEOUS MATERIAL SUITABLE FOR USE AS AN AGGREGATE AND THE LIKE, WHICH COMPRISES MIXING A RAW ARGILLACEOUS MATERIAL WITH WATER TO FORM A SLURRY, AND DROPPING THE SLURRY IN A THIN FREE FALLING STREAM VERTICALLY THROUGH A FURNACE AT A TEMPERATURE SUFFICIENT TO IMMEDIATELY PRODUCE EXPANDED, POROUS, LIGHT-WEIGHT LUMPS OF BURNED ARGILLACEOUS MATERIAL.
Claim 2
Independent Claim
62 words
THE METHOD OF PRODUCING AN EXPANDED, POROUS, LIGHT-WEIGHT BURNED ARGILLACEOUS MATERIAL SUITABLE FOR USE AS AN AGGREGATE AND THE LIKE, WHICH COMPRISES MIXING A RAW ARGILLACEOUS MATERIAL WITH WATER TO FORM A SLURRY, AND DROPPING THE SLURRY IN A THIN FREE FALLING STREAM VERTICALLY THROUGH A FURNACE AT A TEMPERATURE SUFFICIENT TO IMMEDIATELY PRODUCE EXPANDED, POROUS, LIGHT-WEIGHT LUMPS OF BURNED ARGILLACEOUS MATERIAL.
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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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |