US2728733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-weight aggregates of perlite fines and clay
Assignee: Research Counsel Inc
•
Filing: 1950-09-26
•
Granted: 1955-12-27
•
Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Hashimoto Tadaichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:47
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/02; C04B18/027; Y; Y10; Y10S; Y10S106/00; Y10S106/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
NON-COMBUSTIBLE AGGREGATE ESSENTIALLY OF FINES FROM THE POPPING OF PERLITE BONDED TOGETHER BY CLAY, SAID MIXTURE BEING FIRED AT 1600 TO 2000*F. WITHOUT PRODUCING A GLAZE, SAID AGGREGATE BEING POROUS THROUGHOUT, MEASURING BETWEEN 6 AND 60 MESH, AND BEING STRONG ENOUGH TO WITHSTAND WITHOUT SUBSTANTIAL PULVERIZATION THE WEIGHT OF AN AVERAGE PERSON WALKING ON IT.
Claim 2
Dependent Claim
55 words
NON-COMBUSTIBLE AGGREGATE ESSENTIALLY OF FINES FROM THE POPPING OF PERLITE BONDED TOGETHER BY CLAY, SAID MIXTURE BEING FIRED AT 1600 TO 2000*F. WITHOUT PRODUCING A GLAZE, SAID AGGREGATE BEING POROUS THROUGHOUT, MEASURING BETWEEN 6 AND 60 MESH, AND BEING STRONG ENOUGH TO WITHSTAND WITHOUT SUBSTANTIAL PULVERIZATION THE WEIGHT OF AN AVERAGE PERSON WALKING ON IT.
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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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |