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Patent US3412489A successfully refreshed from Google Patents.
US3412489A
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Coupling apparatus
Assignee: SWENSON SPREADER AND Manufacturing CO
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Filing: 1966-09-08
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Granted: 1968-11-26
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Expires: 1986-09-08
Abstract
No abstract record available.
Inventors
- 👤 Klapprodt Glen
- 👤 Eskil W Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/3604; E01; E01H; E01H5/00; E01H5/04; E01H5/08; E01H5/09; E01H5/098
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256273A
Cited
US2590210A
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US2710464A
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US2794678A
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US3034587A
Cited
US3233350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |