Patent US3427342A successfully refreshed from Google Patents.
US3427342A
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Continuous sulfonation process
Assignee: Chemithon Corp
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Filing: 1966-11-21
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Granted: 1969-02-11
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Expires: 1986-11-21
Abstract
No abstract record available.
Inventors
- 👤 Richard J Brooks
- 👤 Burton Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:17
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; B01D53/1481; B01F; B01F27/00; B01F27/27; B01F27/272; B01J; B01J10/00; B01J10/02; B01J19/00; B01J19/18; B01J19/1862; C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/80; C01B17/806; C07; C07B; C07B45/00; C07B45/02; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06; C07C303/24; B01F25/00; B01F2025/91; B01F2025/911; B01F27/80; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/00087; B01J2219/00094; B01J2219/00105; B01J2219/0011; B01J2219/0015; B01J2219/00155; B01J2219/00159; B01J2219/00162; B01J2219/00164; B01J2219/00168; B01J2219/00177; B01J2219/18; B01J2219/182; B01J2219/185; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23774E
Cited
US1498168A
Cited
US2187244A
Cited
US2190136A
Cited
US2240935A
Cited
US2290167A
Cited
US2492706A
Cited
US2691040A
Cited
US2697031A
Cited
US2931822A
Cited
US2830081A
Cited
US2923728A
Cited
US3058920A
Cited
US3200140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |