Patent US3869807A successfully refreshed from Google Patents.
US3869807A
Expired / Lapsed
US
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Method for creating inert gas barrier for product feed conduit
Assignee: Phillips Petroleum Co
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Filing: 1973-07-30
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Granted: 1975-03-11
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Expires: 1993-07-30
Abstract
Abstract In an operation in which a vapor lock system is employed consisting essentially of two star valves, butterfly valves or the like for transferring solid particulate product from one point in the operation to another and wherein a minimum loss of valuable reactant with purge gas introduced between the valves is desired the improvement permitting reduced amount of purge gas and other advantages which comprises introducing purge gas down stream of the down stream valve.
Inventors
- 👤 Robert J Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:31
CPC Classifications
F; F26; F26B; F26B25/00; F26B25/008; C; C08; C08F; C08F10/00; C08F6/00; C08F6/001; C08F6/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
In a system for the transfer of a mass of particulate solids to a receptacle through a vapor lock system consisting essentially of a transfer conduit and at least two butterfly or star-type valves which are opened sequentially a method for minimizing the introduction of vapors into the vapor lock system comprising introducing purge gas into the transfer conduit at a point below the lower most valve and above the lower end of the transfer conduit.
Claim 2
Dependent Claim
76 words
In a system for the transfer of a mass of particulate solids to a receptacle through a vapor lock system consisting essentially of a transfer conduit and at least two butterfly or star-type valves which are opened sequentially a method for minimizing the introduction of vapors into the vapor lock system comprising introducing purge gas into the transfer conduit at a point below the lower most valve and above the lower end of the transfer conduit.
Claim 3
Dependent Claim
76 words
In a system for the transfer of a mass of particulate solids to a receptacle through a vapor lock system consisting essentially of a transfer conduit and at least two butterfly or star-type valves which are opened sequentially a method for minimizing the introduction of vapors into the vapor lock system comprising introducing purge gas into the transfer conduit at a point below the lower most valve and above the lower end of the transfer conduit.
Claim 4
Dependent Claim
76 words
In a system for the transfer of a mass of particulate solids to a receptacle through a vapor lock system consisting essentially of a transfer conduit and at least two butterfly or star-type valves which are opened sequentially a method for minimizing the introduction of vapors into the vapor lock system comprising introducing purge gas into the transfer conduit at a point below the lower most valve and above the lower end of the transfer conduit.
Claim 5
Dependent Claim
34 words
The method according to claim 1 in which the particulate solids are polypropylene solids which have been flashed to remove diluent and then substantially dried prior to being passed to the vapor lock system.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the pressure beneath the lower most valve is substantially lower than that existing above the vapor lock system.
Claim 7
Dependent Claim
24 words
The method of claim 2 wherein the pressure beneath the lower most valve is substantially lower than that existing above the vapor lock system.
References Cited (Backward Citations)
US3152872A
Cited
US3190509A
Cited
US3279087A
Cited
US3421229A
Cited
US3612144A
Cited
US3724090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |