Patent US2143974A successfully refreshed from Google Patents.
US3029946A
Expired / Lapsed
US
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Clamping means for material separators
Assignee: Southwestern Engineering Co
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Filing: 1960-03-28
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Granted: 1962-04-17
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Expires: 1980-03-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard W Wright
- 👤 Spencer Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:41
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/48; B07B1/28; B07B1/38
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |