Patent US3497139A successfully refreshed from Google Patents.
US3497139A
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Apparatus for uniform discharge of liquid or pasty fertilizers
Assignee: BASF SE
•
Filing: 1968-04-26
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Granted: 1970-02-24
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Expires: 1988-04-26
Abstract
No abstract record available.
Inventors
- 👤 Hermann Pottgiesser
- 👤 August Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:14
CPC Classifications
A; A01; A01C; A01C23/00; A01C23/04; A01C23/047; A01C23/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1488356A
Cited
US1731515A
Cited
US1937040A
Cited
US2835537A
Cited
US3103311A
Cited
US3288052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |