US3021784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped charge unit for well perforators
Assignee: Borg Warner Corp
•
Filing: 1955-09-21
•
Granted: 1962-02-20
•
Expires: 1975-09-21
Abstract
No abstract record available.
Inventors
- 👤 Lorrain D Meddick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:47
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117; F; F42; F42B; F42B3/00; F42B3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR524903A
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FR524904A
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GB574132A
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US2603155A
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FR997992A
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US2513233A
Cited
US2708408A
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US2792783A
Cited
GB692741A
Cited
FR1022867A
Cited
US2798431A
Cited
US2819673A
Cited
FR1098104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |