Patent US1536390A successfully refreshed from Google Patents.
US1536390A
Expired / Lapsed
US
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Skimmer-scoop assembly
Assignee: KEYSTONE DRILLER CO
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Filing: 1921-06-27
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Granted: 1925-05-05
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Expires: 1941-06-27
Abstract
No abstract record available.
Inventors
- 👤 Downie Robert Rex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:59
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/46; E02F3/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-05-04 | 1928-11-03 | 1929-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-04 | 1932-11-03 | 1933-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-04 | 1936-11-03 | 1937-05-05 | $7700.00 | Window Closed / Lapsed |