Patent US2952342A successfully refreshed from Google Patents.
US2952342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust filter having spaced filter elements and frame for holding same
Assignee: Individual
•
Filing: 1958-02-12
•
Granted: 1960-09-13
•
Expires: 1978-02-12
Abstract
No abstract record available.
Inventors
- 👤 Schnittker George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US378188A
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US764922A
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US1598097A
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US2421743A
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US2393419A
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US2639003A
Cited
US2677436A
Cited
US2675887A
Cited
US2754928A
Cited
US2818937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |