Patent US2569323A successfully refreshed from Google Patents.
US2569323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making lightweight aggregate
Assignee: Individual
•
Filing: 1949-04-25
•
Granted: 1951-09-25
•
Expires: 1969-04-25
Abstract
No abstract record available.
Inventors
- 👤 Maynard Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:25
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
THE METHOD OF PRODUCING A LIGHTWEIGHT AGGREGATE FROM A HYDRATED, PHOSPHATIC, VOLCANIC ASH MATERIAL HAVING APPROXIMATELY THE FOLLOWING COMPOSITION:
Claim 2
Independent Claim
19 words
THE METHOD OF PRODUCING A LIGHTWEIGHT AGGREGATE FROM A HYDRATED, PHOSPHATIC, VOLCANIC ASH MATERIAL HAVING APPROXIMATELY THE FOLLOWING COMPOSITION:
References Cited (Backward Citations)
US2313746A
Cited
US1751163A
Cited
US1877136A
Cited
US1920773A
Cited
US2015381A
Cited
US2136793A
Cited
US2304382A
Cited
US2478757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |