US3022840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collecting rotary rock drill
Assignee: MSA Safety Inc
•
Filing: 1959-03-19
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Granted: 1962-02-27
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Expires: 1979-03-19
Abstract
No abstract record available.
Inventors
- 👤 Edward J Hohos
- 👤 George L Alston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
B; B23; B23Q; B23Q1/00; B23Q1/0009; B23Q1/0018; B23Q1/0027; B23Q1/0036; E; E21; E21B; E21B21/00; E21B21/01; E21B21/015; E21B21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20468E
Cited
GB191218443A
Cited
US1479668A
Cited
GB319179A
Cited
US2124609A
Cited
US2650071A
Cited
US2839273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |