Patent US1784476A successfully refreshed from Google Patents.
US1784476A
Expired / Lapsed
US
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Cleaning device for rotary drilling tools
Assignee: ZUBLIN
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Filing: 1929-01-05
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Granted: 1930-12-09
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Expires: 1949-01-05
Abstract
No abstract record available.
Inventors
- 👤 John A Zublin
- 👤 Elmer T Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:17
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18; E21B10/083; E21B10/22
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) | 1933-12-08 | 1934-06-09 | 1934-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-08 | 1938-06-09 | 1938-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-08 | 1942-06-09 | 1942-12-09 | $7700.00 | Window Closed / Lapsed |