Patent US2248131A successfully refreshed from Google Patents.
US2248131A
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Filtering and packing material apparatus and method for making
Assignee: Individual
•
Filing: 1937-11-17
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Granted: 1941-07-08
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Expires: 1957-11-17
Abstract
No abstract record available.
Inventors
- 👤 Leroy R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; C; C10; C10M; C10M175/00; C10M175/0058; B01D2239/00; B01D2239/02; B01D2239/0283; B01D2239/04; B01D2239/0464; B01D2239/06; B01D2239/065; B01D2239/0672; B01D2239/08; B01D2239/086; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-07 | 1945-01-06 | 1945-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-07 | 1949-01-06 | 1949-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-07 | 1953-01-06 | 1953-07-08 | $7700.00 | Window Closed / Lapsed |