Patent US2730176A successfully refreshed from Google Patents.
US2730176A
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Means for loosening pipes in underground borings
Assignee: Individual
•
Filing: 1952-03-25
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Granted: 1956-01-10
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Expires: 1972-03-25
Abstract
No abstract record available.
Inventors
- 👤 Herbold Wolfgang Konrad Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:42
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/005; E21B29/00; Y; Y10; Y10S; Y10S116/00; Y10S116/18; Y10S29/00; Y10S29/046; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815; Y10T29/49822; Y10T29/49824; Y10T74/00; Y10T74/18; Y10T74/18544; Y10T74/18552
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1695749A
Cited
US1671528A
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US2198148A
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US2304330A
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US2261564A
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GB541057A
Cited
US2340959A
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US2422639A
Cited
US2501761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |