Patent US3501179A successfully refreshed from Google Patents.
US3501179A
Expired / Lapsed
US
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Helically corrugated spiral pipe and coupling therefor
Assignee: Contech Engineered Solutions LLC
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Filing: 1968-08-01
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Granted: 1970-03-17
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Expires: 1988-08-01
Abstract
No abstract record available.
Inventors
- 👤 Jerald H Boynton
- 👤 Dale D Felton
- 👤 Joseph Moffa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:06
CPC Classifications
F; F16; F16L; F16L25/00; F16L25/0036; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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CA769622A
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US1839761A
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US2095702A
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US2821768A
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US2787442A
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CH349784A
Cited
US3028290A
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US3131954A
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US3298721A
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US3239254A
Cited
FR1488423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |