Patent US2767928A successfully refreshed from Google Patents.
US2767928A
Expired / Lapsed
US
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Plural stage impact breaker with impacting rotors and adjacent deflector screen grates
Assignee: Pettibone Traverse Lift LLC
•
Filing: 1950-12-18
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Granted: 1956-10-23
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Expires: 1970-12-18
Abstract
No abstract record available.
Inventors
- 👤 Albert B Hanse
- 👤 Fred W Rollins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:26
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/282; B02C13/02; B02C13/06; B02C13/09; B02C13/095
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |