US2935267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for continuously processing expanded perlite
Assignee: Individual
•
Filing: 1956-10-12
•
Granted: 1960-05-03
•
Expires: 1976-10-12
Abstract
No abstract record available.
Inventors
- 👤 Wilfred C Maxey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106; B02; B02C; B02C13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD OF CONTINUOUSLY PROCESSING EXPANDED PERLITE, COMPRISING: FORMING A RAW MATERIAL STREAM CONTAINING EXPANDED PERLITE AND REFUSE, GRINDING THE RAW MATERIAL STREAM TO PROVIDE AN UNCLASSIFIED MATERIAL STREAM CONTAINING GROUND PERLITE AND REFUSE, SUSPENDING SAID UNCLASSIFIED STREAM IN A MOVING AIR CURRENT TO PROVIDE AN AIRBONE UNCLASSIFIED STREAM, CONTINUOUSLY AIR CLASSIFYINGSAID UNCLASSIFIED STREAM TO PROVIDE A PARTIALLY CLASSIFIED AIRBORNE STREAM AND A HEAVY COARSE STREAM, RETURNING SAID HEAVY STREAM FOR REGRINDING, LIGHTLY GRINDING SAID PARTIALLY CLASSIFIED AIRBORNE STREAM, CONTINUOUSLY PASSING SAID PARTIALLY CLASSIFIED LIGHTLY GROUND AIRBORNE STREAM THROUGH A SERIES OF AIR CLASSIFICATION STEPS IN EACH OF WHICH A HEAVIER PORTION OF THE STREAM IS SEPARATED FROM THE BALANCE OF THE STREAM, RETURNING THE HEAVIER PORTION OF THE STREAM FROM THE FIRST STEP IN SAID SERIES FOR REGRINDING, LIGHTLY GRINDING THE HEAVIER PORTION OF THE STREAM FROM EACH LATER STEP IN SAID SERIES AND THEN RETURNING IT TO REPEAT SAID FIRST STEP, AND COLLECTING THE BALANCE OF THE STREAM FROM THE LAST STEP IN SAID SERIES AS A FINISHED PRODUCT.
Claim 2
Independent Claim
171 words
A METHOD OF CONTINUOUSLY PROCESSING EXPANDED PERLITE, COMPRISING: FORMING A RAW MATERIAL STREAM CONTAINING EXPANDED PERLITE AND REFUSE, GRINDING THE RAW MATERIAL STREAM TO PROVIDE AN UNCLASSIFIED MATERIAL STREAM CONTAINING GROUND PERLITE AND REFUSE, SUSPENDING SAID UNCLASSIFIED STREAM IN A MOVING AIR CURRENT TO PROVIDE AN AIRBONE UNCLASSIFIED STREAM, CONTINUOUSLY AIR CLASSIFYINGSAID UNCLASSIFIED STREAM TO PROVIDE A PARTIALLY CLASSIFIED AIRBORNE STREAM AND A HEAVY COARSE STREAM, RETURNING SAID HEAVY STREAM FOR REGRINDING, LIGHTLY GRINDING SAID PARTIALLY CLASSIFIED AIRBORNE STREAM, CONTINUOUSLY PASSING SAID PARTIALLY CLASSIFIED LIGHTLY GROUND AIRBORNE STREAM THROUGH A SERIES OF AIR CLASSIFICATION STEPS IN EACH OF WHICH A HEAVIER PORTION OF THE STREAM IS SEPARATED FROM THE BALANCE OF THE STREAM, RETURNING THE HEAVIER PORTION OF THE STREAM FROM THE FIRST STEP IN SAID SERIES FOR REGRINDING, LIGHTLY GRINDING THE HEAVIER PORTION OF THE STREAM FROM EACH LATER STEP IN SAID SERIES AND THEN RETURNING IT TO REPEAT SAID FIRST STEP, AND COLLECTING THE BALANCE OF THE STREAM FROM THE LAST STEP IN SAID SERIES AS A FINISHED PRODUCT.
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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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |