US3528506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex implement
Assignee: Case LLC
•
Filing: 1968-01-02
•
Granted: 1970-09-15
•
Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 William D Drummond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:09
CPC Classifications
A; A01; A01B; A01B21/00; A01B21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1906753A
Cited
US2060196A
Cited
US2081083A
Cited
US2136550A
Cited
US2515016A
Cited
US2669171A
Cited
US2590158A
Cited
US3066746A
Cited
US3239014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |