US2803589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for flash evaporation treatment
Assignee: Individual
•
Filing: 1952-12-03
•
Granted: 1957-08-20
•
Expires: 1972-12-03
Abstract
No abstract record available.
Inventors
- 👤 Eleanore T Allen
- 👤 Katharine T Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:18
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/06; B01D3/065; Y; Y10; Y10S; Y10S159/00; Y10S159/17
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
IN A SYSTEM OF FLASH EVAPORATION IN WHICH PURIFIED SOLVENT IS OBTAINED FROM A SOLUTION OF A SOLID IN A SOLVENT, THE METHOD OF OPERATION WHICH CONSISTS IN SIMULTANEOUSLY EXPOSING BOTH A STREAM OF SAID SOLUTION AND A STREAM OF THE PURE SOLVENT IN THE SAME CONFINED SPACE, BOTH STREAMS BEING DEVELOPED SEPARATELY IN THE FORM OF THIN SHEETS AND SMALL DROPS AND MAINTAINED AS INDIVIDUAL STREAMS, THE STREAM OF SOLUTION BEING AT A PRDETERMINED HIGHER TEMPERATURE THAN THE STREAM OF PURE SOLVENT, LEADING TO THE TRANSFER OF VAPORIZED SOLVENT AND ITS CONCONITANT LATENT HEAT FROM THE SOLUTION TO THE STREAM OF PURE
References Cited (Backward Citations)
US643702A
Cited
US713297A
Cited
US1204716A
Cited
US1799478A
Cited
US1758595A
Cited
US1881041A
Cited
US2159303A
Cited
US2446880A
Cited
US2358559A
Cited
GB574885A
Cited
US2459531A
Cited
US2514943A
Cited
US2510548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |