Apparatus for preparing high-concentration alkali
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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May 22, 1990
Issued Date -
N/A
app pub date -
Jun 2, 1988
filing date -
Apr 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high pressure evaporation vessel which is operated at a predeterminate pressure above atmospheric pressure, is connected to a low pressure expansion vessel which is operated at a predeterminate pressure below the pressure prevailing in the high pressure evaporation vessel, through a U-shaped siphon tube. The U-shaped siphon tube contains a liquid column absorbing the pressure difference existing between the high pressure evaporation vessel and the low pressure expansion vessel.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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SULZER-ESCHER WYSS AG | ZURICH |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Kobayashi, Takayuki | Ube, JP | 235 | 2198 |
# of filed Patents : 235 Total Citations : 2198 | |||
Sala, Siro | Como, IT | 2 | 0 |
# of filed Patents : 2 Total Citations : 0 | |||
Winkler, Robert | Wallisellen, CH | 9 | 21 |
# of filed Patents : 9 Total Citations : 21 | |||
Yokota, Shinjiro | Ube, JP | 4 | 19 |
# of filed Patents : 4 Total Citations : 19 |
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- B01D Class
- 0 % this patent is cited more than
- 35 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

Legal Events
Date | Code | Event | Description |
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Jan 23, 2018 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Mar 24, 2003 | LAPS | LAPSE FOR FAILURE TO PAY MAINTENANCE FEES | |
Mar 23, 2003 | FP | LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE | Effective Date: Mar 23, 2003 |
Oct 09, 2002 | REMI | MAINTENANCE FEE REMINDER MAILED | |
Aug 21, 2001 | CC | CERTIFICATE OF CORRECTION | |
Mar 23, 1999 | I | Issuance | |
Jul 18, 1997 | F | Filing | |
Jul 18, 1997 | PD | Priority Date | |
Jul 08, 1997 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PUCILLO, BARRY;REEL/FRAME:008685/0335 Owner name: AMERICAN LOUVER COMPANY, ILLINOIS Effective Date: Jul 08, 1997 |

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