US3224797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal joint band for double bell concrete pipe
Assignee: American Pipe and Construction Co
•
Filing: 1962-05-04
•
Granted: 1965-12-21
•
Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Delbert A Hausmann
- 👤 Miller William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/022; F16L25/00; F16L25/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1484355A
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GB235652A
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US1913779A
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US2234643A
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US2729873A
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US2719348A
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FR61645E
Cited
GB731165A
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US2900199A
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US2816323A
Cited
US2896976A
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US2829910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |