Patent US3306441A successfully refreshed from Google Patents.
Patent US2677339A successfully refreshed from Google Patents.
US2677339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planter seed covering attachment
Assignee: Individual
•
Filing: 1951-09-20
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Granted: 1954-05-04
•
Expires: 1971-09-20
Abstract
No abstract record available.
Inventors
- 👤 Armstrong Alfred
- 👤 Wake Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:29
CPC Classifications
A; A01; A01C; A01C5/00; A01C5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US719823A
Cited
US808000A
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US886665A
Cited
US1021017A
Cited
US1084307A
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US1293603A
Cited
US1573800A
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US1524369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |