US2587845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calcium hypochlorite bleach liquor
Assignee: Paper Patents Co
•
Filing: 1949-10-08
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Granted: 1952-03-04
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Expires: 1969-10-08
Abstract
No abstract record available.
Inventors
- 👤 Harold H Heller
- 👤 Robert G Shirriff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:35
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/04; C01B11/06; C01B11/064
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A CONTINUOUS CYCLIC PROCESS FOR PRODUCING AN AQUEOUS SOLUTION OF CALCIUM HYPOCHLORITE SUITABLE FOR USE IN BLEACHING PULP FOR PAPERMAKING, WHICH COMPRISES CONTINUOUSLY FEEDING AND REACTING CHLORINE GAS AND A LIME SUSPENSION IN AN AGITATED REACTION ZONE, RECIRCULATING SUCH REACTED SUSPENSION, CONTINUOUSLY WITHDRAWING PART OF SAID REACTED SUSPENSION INTO A SETTLING ZONE, WITHDRAWING SUPER-LYING FINISHED BLEACH LIQUOR FROM SAID SETTLING ZONE, DILUTING THE SETTLED SLUDGE WITH AN AQUEOUS LIQUID AND INTRODUCING IT INTO A SECOND SETTLING ZONE, AND RETURNING
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) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |