US3498028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for contacting liquids and gases
Assignee: Shell USA Inc
•
Filing: 1967-06-19
•
Granted: 1970-03-03
•
Expires: 1987-06-19
Abstract
No abstract record available.
Inventors
- 👤 Cornelis Trouw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:51
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/21; B01F23/213; B01F23/2132; B01F25/00; B01F25/20; B01F25/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1149322A
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US1511749A
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US1625997A
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US2353865A
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US2684231A
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US2833530A
Cited
US3296774A
Cited
US3294381A
Cited
US3304694A
Cited
US3345046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |