US3615142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prilling tower
Assignee: Kemanord AB
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Filing: 1969-01-29
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Granted: 1971-10-26
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Expires: 1989-01-29
Abstract
Abstract A PRILLING TOWER INCLUDES A SHAFT THE WALLS OF WHICH ARE MADE OF A FLEXIBLE NONWETTABLE CORROSION RESISTANT MATERIAL HAVING LOW THERMAL CONDUCTIVITY. THE WALLS ARE PREFERABLY FORMED OF PLASTIC MATERIAL OR PLASTIC COATED FABRIC. THE WALLS MAY BE EMPLOYED FOR COVERING THE SHAFT WALLS OF A CONVENTIONAL PRILLING TOWER, OR THE WALLS MAY BE ATTACHED TO A RIGID FRAMEWORK. IN ONE FORM OF THE INVENTION, THE TOWER COMPRISES AT LEAST TWO SHAFTS HAVING ONE SHAFT WALL IN COMMON.
Inventors
- 👤 Lars-Olov Dahlbom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:33
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02
Claims Analysis
Total Claims: 0
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |