Patent US4257533A successfully refreshed from Google Patents.
US4257533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of discharging slurry by varying valve openings
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1979-03-16
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Granted: 1981-03-24
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Expires: 1999-03-16
Abstract
Abstract A slurry containing polymer particles having an average particle diameter of 0.1 to 1 mm suspended therein is discharged smoothly from a discharge valve without valve clogging by operating the valve such that the degree of valve opening is set within a range II for a valve operating time t1 and within a range III for a valve operating time t2; the time t1 being from 5 to 60 seconds, the time t2 being from 1 to 10 seconds, the range II being a range of valve openings at which the valve is gradually clogged with the polymer particles discharged, and the range III being a range of valve openings at which the valve permits continuous discharge without clogging.
Inventors
- 👤 Kiyoshi Matsuyama
- 👤 Shozi Ishikawa
- 👤 Seizi Hirata
- 👤 Tsutomu Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:06
CPC Classifications
B; B01; B01J; B01J4/00; B01J4/008; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86421
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A method for discharging through a discharge valve a slurry containing polymer particles having an average particle diameter of 0.1 to 1 mm suspended therein, wherein the valve is so operated that the degree of the valve opening is set within a range II for a valve operating time t 1 and within a range III for a valve operating time t 2 , and this operation is repeated periodically; the time t 1 being from 5 to 60 seconds, the time t 2 being from 1 to 10 seconds, the range II being a range at which the valve is gradually clogged with the polymer particles discharged and the range III being a range at which the valve permits continuous discharge without clogging.
Claim 2
Independent Claim
124 words
A method for discharging through a discharge valve a slurry containing polymer particles having an average particle diameter of 0.1 to 1 mm suspended therein, wherein the valve is so operated that the degree of the valve opening is set within a range II for a valve operating time t 1 and within a range III for a valve operating time t 2 , and this operation is repeated periodically; the time t 1 being from 5 to 60 seconds, the time t 2 being from 1 to 10 seconds, the range II being a range at which the valve is gradually clogged with the polymer particles discharged and the range III being a range at which the valve permits continuous discharge without clogging.
Claim 3
Dependent Claim
41 words
The method of claim 1, wherein the degree of valve opening during the time t 1 is different from one cycle to the next or the degree of valve opening during the time t 1 is the same during each cycle.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein the degree of valve opening during the time t 1 is continuously varied during the time t 1 .
Claim 5
Dependent Claim
31 words
The method of claim 1, wherein the degree of the valve opening during the time t 1 is varied within range II in short cycles during the time t 1 .
Claim 6
Dependent Claim
33 words
The method of claim 4, wherein the degree of the valve opening during the time t 1 is varied substantially continuously within range II in short cycles during the time t 1 .
Claim 7
Dependent Claim
32 words
The method of claim 1, 2, 3, 4 or 5, wherein the time t 1 is from 10 to 30 seconds, and the time t 2 is from 1 to 3 seconds.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |