Patent US3137480A successfully refreshed from Google Patents.
US3137480A
Expired / Lapsed
US
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Variable gradient device
Assignee: Technicon Chromatography Corp
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Filing: 1962-04-26
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Granted: 1964-06-16
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Expires: 1982-04-26
Abstract
No abstract record available.
Inventors
- 👤 Isreeli Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:00
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A VARIABLE GRADIENT DEVICE, COMPRISING: (A) A SERIES OF SEPARATE AND INDIVIDUAL MEMBERS WHICH ARE SUBSTANTIALLY UNIFORM AND ARE ARRANGED IN BACK-TO-FRONT RELATION AND CONNECTED TO EACH OTHER TO FORM A SERIES OF LONGITUDINALLY SPACED SUBSTANTIALLY UNIFORM CHAMBERS FOR THE VALVE-CONTROLLED FLOW OF LIQUID FROM THE BOTTOM OF A CHAMBER INTO AN ADJACENT CHAMBER, (B) EACH OF SAID MEMBERS HAVING INTEGRAL PARTS IN ENGAGEMENT WITH INTEGRAL PARTS OF AN ADJACENT MEMBER FOR SUPPORTING SAID MEMBERS IN SAID RELATION AND THEREBY FORMING SAID SERIES OF CHAMBERS, AND (C) VALVE MEANS FOR EACH OF SAID CHAMBERS TO CONTROL SAID FLOW OF LIQUID FROM ONE CHAMBER TO AN ADJACENT CHAMBER.
Claim 2
Dependent Claim
107 words
A VARIABLE GRADIENT DEVICE, COMPRISING: (A) A SERIES OF SEPARATE AND INDIVIDUAL MEMBERS WHICH ARE SUBSTANTIALLY UNIFORM AND ARE ARRANGED IN BACK-TO-FRONT RELATION AND CONNECTED TO EACH OTHER TO FORM A SERIES OF LONGITUDINALLY SPACED SUBSTANTIALLY UNIFORM CHAMBERS FOR THE VALVE-CONTROLLED FLOW OF LIQUID FROM THE BOTTOM OF A CHAMBER INTO AN ADJACENT CHAMBER, (B) EACH OF SAID MEMBERS HAVING INTEGRAL PARTS IN ENGAGEMENT WITH INTEGRAL PARTS OF AN ADJACENT MEMBER FOR SUPPORTING SAID MEMBERS IN SAID RELATION AND THEREBY FORMING SAID SERIES OF CHAMBERS, AND (C) VALVE MEANS FOR EACH OF SAID CHAMBERS TO CONTROL SAID FLOW OF LIQUID FROM ONE CHAMBER TO AN ADJACENT CHAMBER.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |