Patent US3687818A successfully refreshed from Google Patents.
US3687818A
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Distillation apparatus
Assignee: Solvay Solutions UK Ltd
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Filing: 1970-02-03
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Granted: 1972-08-29
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Expires: 1990-02-03
Abstract
Abstract A PACKING FOR A DISTILLATION COLUMN ESPECIALLY USEFUL IN LOW PRESSURE DISTILLATIONS CONSISTS OF A PLURALITY OF PLATES EACH COMPRISING TWO SHEETS OF EXPANDED METAL PLACED BACK TO BACK IN A STAGGERING CONFIGURATION.
Inventors
- 👤 Kenneth E Porter
- 👤 Stephen R M Ellis
- 👤 Clifford H G Hands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:49
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/32; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32286; B01J2219/32289; B01J2219/324; B01J2219/32408
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |