US3515223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hitch construction for two tandem disk harrows
Assignee: Deere and Co
•
Filing: 1968-04-08
•
Granted: 1970-06-02
•
Expires: 1988-04-08
Abstract
No abstract record available.
Inventors
- 👤 Charles Harold Youngberg
- 👤 Dennis Luverne Larson
- 👤 Barton Lee Swales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:30
CPC Classifications
A; A01; A01B; A01B21/00; A01B21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US267294A
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US357254A
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US787011A
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US1428543A
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US1561849A
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US1613079A
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US1827920A
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US2182260A
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US2617342A
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US2709085A
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US2755613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |