US3071297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hyperbolic hopper outlet means
Assignee: Individual
•
Filing: 1961-09-14
•
Granted: 1963-01-01
•
Expires: 1981-09-14
Abstract
No abstract record available.
Inventors
- 👤 Lee Yee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:00
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/26; B65D88/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A HOPPER FOR DISCHARGING BULK SOLID MATERIALS HAVING A HOPPER OUTLET DEVICE COMPRISING A PERIPHERAL WALL CONVERGING DOWNWARDLY AND CONCAVING INWARDLY AND HAVING A DISCHARGE OPENING AT THE LOWER END THEREOF, SAID PERIPHERAL WALL HAVING A CURVILINEAR INNER SURFACE FORMED IN ACCORDANCE WITH A CURVE LYING BETWEEN AND INCLUDING A CURVE DEFINED BY THE EXPRESSION: WHEREIN A0 IS THE TRANSVERSE CROSS-SECTIONAL AREA AT THE UPPER END OF THE HOPPER OUTLET DEVICE, A IS THE TRANSVERSE CROSS-SECTIONAL AREA AT A PLANE SPACED AT A DISTANCE Y BELOW THE UPPER END OF THE HOPPER OUTLET DEVICE AND C IS A CONSTANT CORRESPONDING TO A PREDETERMINED RATE OF CONTRACTION OF AREA AND A CURVE DEFINED BY THE EXPRESSION:
References Cited (Backward Citations)
US2979235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |