US2433531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Kendall Co
•
Filing: 1940-07-30
•
Granted: 1947-12-30
•
Expires: 1960-07-30
Abstract
No abstract record available.
Inventors
- 👤 John F Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:16
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0492; B01D2239/06; B01D2239/065; B01D2239/0681; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1291
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) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |