US2535799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with explosion-proof illuminating device
Assignee: Lummus Technology LLC
•
Filing: 1946-08-31
•
Granted: 1950-12-26
•
Expires: 1966-08-31
Abstract
No abstract record available.
Inventors
- 👤 John W Kelley
- 👤 Hyman R Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:17
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D33/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE264037C
Cited
US1247155A
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US1286159A
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US1264143A
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GB216423A
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US1676576A
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US1640512A
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DE489009C
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US1879098A
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US1984513A
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US1989443A
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GB502150A
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US2330935A
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US2394016A
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US2445072A
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US2447922A
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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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |