Patent US3216788A successfully refreshed from Google Patents.
US3216788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash evaporation of pulp liquor to eliminate calcium salts
Assignee: OI Glass Inc
•
Filing: 1961-08-24
•
Granted: 1965-11-09
•
Expires: 1981-08-24
Abstract
No abstract record available.
Inventors
- 👤 John E Hoeft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:30
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/10; D21C11/106
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
THE METHOD OF CONCENTRATING THE RESIDUAL CHEMICAL CONTENT OF AQUEOUS HOT SPENT PULPING LIQUOR PREDUCED BY AN ALKALINE PULPING PROCESS PRIOR TO THERMAL CONCENTRATION THEREOF BY EVAPORATION CHARACTERIZED BY THE INJECTION OF THE HOT SPENT PROCESS LIQUOR INTO AN EVACUATED FLASHING ZONE OF ESSENTIALLY REDUCED PRESSURE AND TEMPERATURE CONDITIONS TO EFFECT PRECIPITATION AND SEPARATION OF CALCIUM SALT CONSTITUENTS FROM THE LIQUOR PRIOR TO ITS CONCENTRATION BY EVAPORATION.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |