US3394534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: MSA Safety Inc
•
Filing: 1967-01-26
•
Granted: 1968-07-30
•
Expires: 1987-01-26
Abstract
No abstract record available.
Inventors
- 👤 Paul D Andrews
- 👤 Robert A Bub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/232; Y; Y10; Y10S; Y10S55/00; Y10S55/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US540856A
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US1958735A
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US2387303A
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US2771155A
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US2907406A
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US2945559A
Cited
GB905113A
Cited
US3249228A
Cited
US3273321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |