Patent US3438742A successfully refreshed from Google Patents.
US3438742A
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Apparatus for continuous sulphonation and/or sulphation of organic substances
Assignee: Mo och Domsjo AB
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Filing: 1964-11-03
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Granted: 1969-04-15
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Expires: 1984-11-03
Abstract
No abstract record available.
Inventors
- 👤 Helmut Grunewald
- 👤 Olof Steijner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:44
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01F; B01F27/00; B01F27/05; B01F27/07; B01F27/072; B01F27/0724; B01F27/0722; B01J19/1806; C; C07; C07B; C07B45/00; C07B45/02; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06; C07C303/24; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |