US2544752A
Expired / Lapsed
US
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Process for making lightweight aggregates using fragile nodules
Assignee: Individual
•
Filing: 1949-06-10
•
Granted: 1951-03-13
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Expires: 1969-06-10
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Gelbman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
B; B28; B28C; B28C7/00; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |