Patent US2579813A successfully refreshed from Google Patents.
US2579813A
Expired / Lapsed
US
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Apparatus for cleaning pipes
Assignee: National Water Main Cleaning Co
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Filing: 1947-03-27
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Granted: 1951-12-25
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Expires: 1967-03-27
Abstract
No abstract record available.
Inventors
- 👤 William A Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:54
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/053; B08B9/055; B08B9/0553; B08B9/043; B08B9/0436
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US323972A
Cited
US332910A
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US1006261A
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US1631562A
Cited
US1608347A
Cited
US1620788A
Cited
US1966819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |