US3025964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zigzag filter element and method of making it
Assignee: MSA Safety Inc
•
Filing: 1958-09-29
•
Granted: 1962-03-20
•
Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 James J Summers
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:06
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0001; B01D27/00; B01D27/005; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D46/52; B01D46/521; B01D46/522; B31; B31D; B31D3/00; B31D3/02; B31D3/0207; B01D2201/00; B01D2201/12; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003; Y10T428/00; Y10T428/23; Y10T428/234; Y10T428/236; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US753781A
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US1677503A
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US1906984A
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US2142894A
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US2410371A
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US2569243A
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US2553054A
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US2610934A
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US2668327A
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GB686418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-19 | 1965-09-18 | 1966-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-19 | 1969-09-18 | 1970-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-19 | 1973-09-18 | 1974-03-20 | $7700.00 | Window Closed / Lapsed |