US2862696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for contacting liquids and gases
Assignee: Shell Development Co
•
Filing: 1955-02-04
•
Granted: 1958-12-02
•
Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
- 👤 Zuiderweg Frederik Johannes
- 👤 Verburg Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:09
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1621728A
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US1643696A
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FR737315A
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US1987630A
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DE633433C
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US2767966A
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US2767967A
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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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |