Patent US2770476A successfully refreshed from Google Patents.
US2770476A
Expired / Lapsed
US
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Plastic interlocking sealing means for sewer pipe joints
Assignee: American Vitrified Products Co
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Filing: 1953-09-08
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Granted: 1956-11-13
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Expires: 1973-09-08
Abstract
No abstract record available.
Inventors
- 👤 Robert B Cleverly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/05; Y; Y10; Y10S; Y10S264/00; Y10S264/60; Y10S285/00; Y10S285/915
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) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |