US2799074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
qarloni
Assignee: —
•
Filing: —
•
Granted: 1957-07-16
•
Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:16
CPC Classifications
—
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
A METHOD OF MAKING A LIGHTWEIGHT AGGREGATE WHICH COMPRISES PLACING A LAYER OF PULVERIZED FLY ASH UPON THE SURFACE OF THE HEARTH OF A KILN, FORMING PELLETS FROM AN ADMIXTURE OF UNBURNED CLAY AND CARBONACEOUS MATERIAL, DRYING THE PELLETS, DROPPING THE DRIED PELLETS UPON THE LAYERS OF FLY ASH ON THE HEARTH SURFACE, AND MAINTAINING TEMPERATURE ZONES WITHIN SAID KILN WHEREBY THE CARBON CONTENT OF SAID LAYER IS BURNED OFF AND SAID PELLETS BECOME BLOATED.
References Cited (Backward Citations)
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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) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |