US2946444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: ZIEVERS
•
Filing: 1955-09-16
•
Granted: 1960-07-26
•
Expires: 1975-09-16
Abstract
No abstract record available.
Inventors
- 👤 James F Zievers
- 👤 Hugh A Currie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:07
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D29/00; B01D29/11; B01D29/117; B01D29/118; B01D29/60; B01D29/605; B01D29/62; B01D29/64; B01D29/6469; B01D29/6476; B01D29/76; B01D29/80; B01D29/82; B01D29/828; B01D29/86; B01D29/88; B01D29/92; B01D29/925; B01D29/94
Claims Analysis
Total Claims: 0
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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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |