Patent US2833213A successfully refreshed from Google Patents.
US2833213A
Expired / Lapsed
US
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Well perforator
Assignee: Borg Warner Corp
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Filing: 1951-04-13
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Granted: 1958-05-06
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Expires: 1971-04-13
Abstract
No abstract record available.
Inventors
- 👤 John J Udry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:06
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US82586A
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US1534011A
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US2402153A
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US2494256A
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US2616370A
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US2543814A
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US2669928A
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US2764938A
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US2708408A
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US2629325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |