US3446291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crust breaker with automatic air control valve
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1967-03-13
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Granted: 1969-05-27
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Expires: 1987-03-13
Abstract
No abstract record available.
Inventors
- 👤 Sebastian F Judd
- 👤 Frederick C Wickersheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:34
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/14
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) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |