Patent US2787202A successfully refreshed from Google Patents.
US2787202A
Expired / Lapsed
US
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Deep tillage chisel and colter for tractor hitches
Assignee: Pittsburgh Forgings Co
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Filing: 1952-08-27
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Granted: 1957-04-02
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Expires: 1972-08-27
Abstract
No abstract record available.
Inventors
- 👤 Cyril M Gladis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:05
CPC Classifications
A; A01; A01B; A01B13/00; A01B13/08; A01B59/00; A01B59/06; A01B59/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2456693A
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GB641744A
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US2569556A
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US2590399A
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US2673510A
Cited
US2698492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |