US2835391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single open end type filter construction
Assignee: Individual
•
Filing: 1954-07-12
•
Granted: 1958-05-20
•
Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Edward W Bottum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:07
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/003; B; B01; B01D; B01D35/00; B01D35/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49909; Y10T29/49913; Y10T29/49925; Y10T29/49927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB128150A
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US1387789A
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US1688401A
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US2216686A
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US2121624A
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US2145047A
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US2304142A
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US2310536A
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US2384057A
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US2548965A
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US2600219A
Cited
US2705013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |