Patent JPS5562833A successfully refreshed from Google Patents.
Patent US2970791A successfully refreshed from Google Patents.
US2970791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic conveyor system
Assignee: CORK
•
Filing: 1954-07-19
•
Granted: 1961-02-07
•
Expires: 1974-07-19
Abstract
No abstract record available.
Inventors
- 👤 William J Hafner
- 👤 Gordon H Cork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:51
CPC Classifications
B; B65; B65G; B65G51/00; B65G51/04; B65G51/36; B65G51/40; B65G51/42; B65G51/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE603042C
Cited
DE489701C
Cited
US2006305A
Cited
US2085265A
Cited
US1983342A
Cited
DE878774C
Cited
US2784851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |