US2938599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soot removal from gases
Assignee: Shell USA Inc
•
Filing: 1957-07-29
•
Granted: 1960-05-31
•
Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Nagelkerke Willem
- 👤 Meijer Gerrit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/04; B; B01; B01D; B01D47/00; B01D47/06; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/36; C01B3/50; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/049; Y; Y10; Y10S; Y10S261/00; Y10S261/09
Claims Analysis
Total Claims: 0
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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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |