US3380780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic conveying systems
Assignee: Individual
•
Filing: 1965-12-23
•
Granted: 1968-04-30
•
Expires: 1985-12-23
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Allen
- 👤 Chester H Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:21
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/52; B65G53/525
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1503365A
Cited
US2120003A
Cited
US2905362A
Cited
US2779510A
Cited
US2872338A
Cited
US2794686A
Cited
US3095097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |