US2595943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening bauxite with calcium sulfate
Assignee: Porocel Industries LLC
•
Filing: 1949-04-26
•
Granted: 1952-05-06
•
Expires: 1969-04-26
Abstract
No abstract record available.
Inventors
- 👤 Heinemann Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/02; B01J27/053; B01J20/00; B01J20/02; B01J20/10; B01J20/12; B01J27/04; B01J27/047; B01J27/051; B01J27/0515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD FOR HARDENING THERMALLY ACTIVATED BAUXITE GRANULES WHICH COMPRISES IMPREGNATING THE BAUXITE GRANULES WITH 2% TO 10% BY WIGHT OF CALCIUM SULFATE BY PRECIPITATION ON THE BAUXITE GRANULES OF THE CALCIUM SULFATE FROM A SOLUTION OF A SOLUBLE SALT OF CALCIUM, AND HEATING THE BAUXITE GRANULES CONTAINING THE CALCIUM SULFATE AT A TEMPERATURE NOT EXCEEDING 1200 DEGRESS F.
Claim 2
Independent Claim
59 words
A METHOD FOR HARDENING THERMALLY ACTIVATED BAUXITE GRANULES WHICH COMPRISES IMPREGNATING THE BAUXITE GRANULES WITH 2% TO 10% BY WIGHT OF CALCIUM SULFATE BY PRECIPITATION ON THE BAUXITE GRANULES OF THE CALCIUM SULFATE FROM A SOLUTION OF A SOLUBLE SALT OF CALCIUM, AND HEATING THE BAUXITE GRANULES CONTAINING THE CALCIUM SULFATE AT A TEMPERATURE NOT EXCEEDING 1200 DEGRESS F.
References Cited (Backward Citations)
US2067920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |