US3744976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venting device
Assignee: WR Grace and Co Conn
•
Filing: 1970-11-23
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Granted: 1973-07-10
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Expires: 1990-11-23
Abstract
Abstract THIS INVENTION CONCERNS A DEVICE WHICH, IN COMBINATION WITH A SECONDARY CONDENSER SYSTEM, EFFECTIVELY REMOVES PARTICULATE MATTER AND NOXIOUS NONCONDENSIBLE FUMES SUCH AS CHLORINE GAS FROM AN AIR STREAM MIXTURE. IN ONE EMBODIMENT, IT COMPRISES A PRESSURE COMPENSATING SECONDARY CONDENSER WHICH IS VENTED INTO A CHAMBER HAVING A GLASS WOOL OR SIMILAR FIBROUS LAYER AND AN ABSORBENT OR REACTIVE MATERIAL LAYER, THIS SECOND LAYER REMOVING THE NOXIOUS GAS FROM THE GAS-AIR STREAM. IN A PARTICULAR EMBODIMENT, THIS DEVICE IS USED IN THE VENTING OF ALUMI- NUM CHLORIDE CONDENSERS TO THE ATMOSPHERE, WITH THE ABSORBENT OR REACTIVE LAYER BEING PREFERABLY A FLAKE ACUSTIC.
Inventors
- 👤 T Tongue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |