US2882017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock-piercing method and blowpipe
Assignee: Union Carbide Corp
•
Filing: 1953-10-16
•
Granted: 1959-04-14
•
Expires: 1973-10-16
Abstract
No abstract record available.
Inventors
- 👤 Carl A Napiorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:21
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE189725C
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GB254966A
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US1912612A
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US2327508A
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US2375180A
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US2523656A
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US2675993A
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US2628817A
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US2738162A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |