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Patent US2801579A successfully refreshed from Google Patents.
US2801579A
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Manhole extension
Assignee: Individual
•
Filing: 1954-09-15
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Granted: 1957-08-06
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Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 William U Vinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:02
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; E02D29/1409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US875775A
Cited
US2593918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |