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US3490538A
Expired / Lapsed
US
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Process and apparatus for controlling the furrow-depth of a plough drawn by a traction-engine
Assignee: Alex Friedmann KG
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Filing: 1967-06-15
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Granted: 1970-01-20
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Expires: 1987-06-15
Abstract
No abstract record available.
Inventors
- 👤 Johann Lipinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:33
CPC Classifications
A; A01; A01B; A01B67/00; Y; Y10; Y10S; Y10S60/00; Y10S60/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |