Patent US3501897A successfully refreshed from Google Patents.
US3501897A
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Process for removing sulfur oxides from gas mixtures
Assignee: Shell USA Inc
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Filing: 1967-11-20
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Granted: 1970-03-24
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Expires: 1987-11-20
Abstract
No abstract record available.
Inventors
- 👤 Henricus J A Van Helden
- 👤 Jaap E Naber
- 👤 Frederik J Zuiderweg
- 👤 Heinz Voetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0423; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/2425; B01J8/00; B01J8/02; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B01D2251/00; B01D2251/60; B01D2251/602; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/30; B01D2253/302; B01D2253/306; B01D2253/308; B01D2253/34; B01D2253/342; B01D2253/3425; B01D2257/00; B01D2257/30; B01D2257/302; B01D2258/00; B01D2258/02; B01D2258/0283; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40088; B01D2259/4009; B01D53/06; B01D53/08; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00212
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732074A
Cited
US2195563A
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US3034947A
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US3300280A
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US3284158A
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US3411865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |