Patent US3019890A successfully refreshed from Google Patents.
US3019890A
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US
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Assignee: Potash Corp of Saskatchewan Inc
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Filing: 1958-04-09
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Granted: 1962-02-06
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Expires: 1978-04-09
Abstract
No abstract record available.
Inventors
- 👤 Raymond R Knill
- 👤 Mclaughlin Asa Lloyd
- 👤 Frederick J Priesnitz
- 👤 Conder Lory Stevens
- 👤 Russell G Haworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
B; B65; B65G; B65G21/00; B65G21/10; B65G21/02; B65G21/04; B65G21/06; B65G21/14; B65G2201/00; B65G2201/04
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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |