US3669637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Odorant replacement in gas streams
Assignee: Gas Technology Institute
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Filing: 1970-05-08
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Granted: 1972-06-13
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Expires: 1990-05-08
Abstract
Abstract ODOR FADING OR ODORANTS IN GAS STREAMS IS COUNTERACTED BY ADDING ODORANTS FROM AN ENCLOSED CONTAINER THROUGH A PERMEABLE MEMBRANE OVER SELECTED TIME PERIODS. THE CONTAINER IS PREFERABLY SELF-DESTRUCTING AFTER THE ODORANT IS EXHAUSTED.
Inventors
- 👤 Donald L Klass
- 👤 Carl D Landahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
C; C10; C10L; C10L3/00; C10L3/003; C10L3/006; B; B01; B01D; B01D61/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |