Patent US2516832A successfully refreshed from Google Patents.
US2516832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of crystals from solutions containing hcn
Assignee: Wyeth Holdings LLC
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Filing: 1947-04-24
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Granted: 1950-07-25
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Expires: 1967-04-24
Abstract
No abstract record available.
Inventors
- 👤 William J Rosenbloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:04
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/242; B; B01; B01D; B01D9/00; B01D9/0018; B01D9/0022; B01D9/0036; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A CRYSTAL FORMING AND SELECTING PROCESS WHICH COMPRISES: PASSING HEATED FEED LIQUOR INTO AN EVAPORATOR, APPLYING VACUUM THERETO, WHEREBY EVAPORATION, COOLING, AND SOLUTE PRECIPITATION IS OBAINED; WITHDRAWING CRYSTAL SLURRY FROM THE EVAPORATOR THROUGH A BAROMETRIC LEG INTO AN INTERMEDIATE LEVEL IN A RECEIVING VESSEL; CONTINUOUSLY WITHDRAWING FROM HE RECEIVING VESSEL CLEAR SOLUTION AT A HIGH LEVEL, A FINER-SIZE CRYSTALS SLURRY AT A LOWER LEVEL BUT ABOUT THE BAROMETRIC LEG DISCHARGE, AND A LARGER-SIZE CRYSTALS SLURRY AT THE LOWEST LEVEL; COMBINING THE FINER-SIZE CRSTALS SLURRY WITH THE INCOMING FEED LIQUOR BEFORE THE LATTER ENTERS THE EVPORATOR; PROPORTIONING THE FEED AND FINER-SIZE CRYSTALS SLURRY TO REDUCE THE TEMPERATURE OF THE MIXTURE TO 2*-10*F. ABOVE
Claim 2
Dependent Claim
112 words
A CRYSTAL FORMING AND SELECTING PROCESS WHICH COMPRISES: PASSING HEATED FEED LIQUOR INTO AN EVAPORATOR, APPLYING VACUUM THERETO, WHEREBY EVAPORATION, COOLING, AND SOLUTE PRECIPITATION IS OBAINED; WITHDRAWING CRYSTAL SLURRY FROM THE EVAPORATOR THROUGH A BAROMETRIC LEG INTO AN INTERMEDIATE LEVEL IN A RECEIVING VESSEL; CONTINUOUSLY WITHDRAWING FROM HE RECEIVING VESSEL CLEAR SOLUTION AT A HIGH LEVEL, A FINER-SIZE CRYSTALS SLURRY AT A LOWER LEVEL BUT ABOUT THE BAROMETRIC LEG DISCHARGE, AND A LARGER-SIZE CRYSTALS SLURRY AT THE LOWEST LEVEL; COMBINING THE FINER-SIZE CRSTALS SLURRY WITH THE INCOMING FEED LIQUOR BEFORE THE LATTER ENTERS THE EVPORATOR; PROPORTIONING THE FEED AND FINER-SIZE CRYSTALS SLURRY TO REDUCE THE TEMPERATURE OF THE MIXTURE TO 2*-10*F. ABOVE
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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) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |