Patent US735776A successfully refreshed from Google Patents.
Patent US2886483A successfully refreshed from Google Patents.
US2886483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system for cellulose digestion plants
Assignee: Rosenblads Patenter AB
•
Filing: 1954-05-25
•
Granted: 1959-05-12
•
Expires: 1974-05-25
Abstract
No abstract record available.
Inventors
- 👤 Rosenblad Curt Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:22
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE PROCESS OF OPERATING AN INDIRECT HEAT EXCHANGER HAVING A TWO PASSAGE SYSTEM FOR ALTERNATELY HEATING DIGESTION LIQUOR FOR ONE OF TWO SEPARATE DIGESTERS IN ONE OF SAID PASSAGES AND SIMULTANEOUSLY CLEANING THE OTHER OF SAID PASSAGES WHICH COMPRISES, CIRCULATING DIGESTION LIQUOR FROM ONE OF SAID DIGESTERS THROUGH ONE OF SAID PASSAGES, AND PASSING A HEATING AND CLEANING MEDIUM THROUGH THE OTHER OF SAID PASSAGES AND THEN REVERSING THE PROCESS BY CUTTING OFF THE FLOW OF DIGESTION LIQUOR THROUGH SAID ONE OF SAID PASSAGES, PASSING HATING AND CLEANING MEDIUM THROUGH SAID ONE OF SAID PASSAGES TO PROVIDE HEAT FOR THE OTHER OF SAID PASSAGES WHILE SIMULTANEOUSLY CLEANING SAID ONE PASSAGE, CIRCULATING DIGESTION LIQUOR FROM THE OTHER
Claim 2
Dependent Claim
116 words
THE PROCESS OF OPERATING AN INDIRECT HEAT EXCHANGER HAVING A TWO PASSAGE SYSTEM FOR ALTERNATELY HEATING DIGESTION LIQUOR FOR ONE OF TWO SEPARATE DIGESTERS IN ONE OF SAID PASSAGES AND SIMULTANEOUSLY CLEANING THE OTHER OF SAID PASSAGES WHICH COMPRISES, CIRCULATING DIGESTION LIQUOR FROM ONE OF SAID DIGESTERS THROUGH ONE OF SAID PASSAGES, AND PASSING A HEATING AND CLEANING MEDIUM THROUGH THE OTHER OF SAID PASSAGES AND THEN REVERSING THE PROCESS BY CUTTING OFF THE FLOW OF DIGESTION LIQUOR THROUGH SAID ONE OF SAID PASSAGES, PASSING HATING AND CLEANING MEDIUM THROUGH SAID ONE OF SAID PASSAGES TO PROVIDE HEAT FOR THE OTHER OF SAID PASSAGES WHILE SIMULTANEOUSLY CLEANING SAID ONE PASSAGE, CIRCULATING DIGESTION LIQUOR FROM THE OTHER
References Cited (Backward Citations)
US1228950A
Cited
CA173132A
Cited
US1882391A
Cited
US2508119A
Cited
US2576843A
Cited
US2647570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |