US2750174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Shell Development Co
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Filing: 1953-02-02
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Granted: 1956-06-12
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Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Myles H R Cogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:13
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/324; B01D3/326; B01D3/16; B01D3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A CONTACT COLUMN, THE COMBINATION OF AN ENCLOSING UPRIGHT WALL DEFINING A CONTACT TANK AND A PLURALITY OF CONTACT TRAY ASSEMBLIES AT DIFFERENT LEVELS WITHIN THE TANK, EACH SAID ASSEMBLY COMPRISING: A CONTACT TRAY HAVING OPENINGS FOR THE PASSAGE OF SUBSTANCES TO BE CONTACTED AND BEING SITUATED IN VERTICALLY SPACED RELATION TO THE TRAYS OF ADJOINING ASSEMBLIES; A TRAY RIM NEAR SAID ENCLOSING WALL SUPPORTINGLY SECURED TO THE TRAY; AND A PLURALITY OF SUPPORTING POSTS SEPARATE FROM SAID TRAY RIMS HAVING HORIZONTAL NOTCHES ON THE SIDES THEREOF AWAY FROM SAID ENCLOSING WALL AT A LEVEL INTERMEDIATE THE ENDS OF THE POSTS, SAID TRAY RIMS BEING IN PART POSITIONED WITHIN SAID NOTCHES
Claim 2
Dependent Claim
112 words
IN A CONTACT COLUMN, THE COMBINATION OF AN ENCLOSING UPRIGHT WALL DEFINING A CONTACT TANK AND A PLURALITY OF CONTACT TRAY ASSEMBLIES AT DIFFERENT LEVELS WITHIN THE TANK, EACH SAID ASSEMBLY COMPRISING: A CONTACT TRAY HAVING OPENINGS FOR THE PASSAGE OF SUBSTANCES TO BE CONTACTED AND BEING SITUATED IN VERTICALLY SPACED RELATION TO THE TRAYS OF ADJOINING ASSEMBLIES; A TRAY RIM NEAR SAID ENCLOSING WALL SUPPORTINGLY SECURED TO THE TRAY; AND A PLURALITY OF SUPPORTING POSTS SEPARATE FROM SAID TRAY RIMS HAVING HORIZONTAL NOTCHES ON THE SIDES THEREOF AWAY FROM SAID ENCLOSING WALL AT A LEVEL INTERMEDIATE THE ENDS OF THE POSTS, SAID TRAY RIMS BEING IN PART POSITIONED WITHIN SAID NOTCHES
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |