US2903252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring of large bores using an elongated guide means in a previously bored guide passageway
Assignee: Individual
•
Filing: 1954-08-16
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Granted: 1959-09-08
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Expires: 1974-08-16
Abstract
No abstract record available.
Inventors
- 👤 Ebeling Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:26
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03; E21D1/06; E21B; E21B4/00; E21B4/18; E21B7/00; E21B7/28; E21D3/00; E21D9/00; E21D9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |