US3190450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for a crystal purification column
Assignee: Phillips Petroleum Co
•
Filing: 1962-08-06
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Granted: 1965-06-22
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Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Stoller
- 👤 Howard W Goard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:57
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/17; B01D29/62; B01D29/70; B01D29/72; B01D35/00; B01D35/14; B01D35/153; B01D9/004; B01D9/005; B01D9/0063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1843242A
Cited
US2148826A
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US2765921A
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US2757800A
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US2775550A
Cited
US2854494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |