US2829908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock dust collecting apparatus
Assignee: MSA Safety Inc
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Filing: 1956-03-08
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Granted: 1958-04-08
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Expires: 1976-03-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Brochetti
- 👤 Edward J Hohos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:21
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; E21B21/015; B; B23; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0053
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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |