US2943700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zigzag filter blank and method of making a filter
Assignee: MSA Safety Inc
•
Filing: 1959-04-27
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Granted: 1960-07-05
•
Expires: 1979-04-27
Abstract
No abstract record available.
Inventors
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/0001; B01D46/10; B01D2275/00; B01D2275/20; B01D2275/203; Y; Y10; Y10S; Y10S55/00; Y10S55/05; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |