US3501179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helically corrugated spiral pipe and coupling therefor
Assignee: Contech Engineered Solutions LLC
•
Filing: 1968-08-01
•
Granted: 1970-03-17
•
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 05:48
CPC Classifications
F; F16; F16L; F16L25/00; F16L25/0036; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US458994A
Cited
CA769622A
Cited
US1839761A
Cited
US2095702A
Cited
US2821768A
Cited
US2787442A
Cited
CH349784A
Cited
US3028290A
Cited
US3131954A
Cited
US3298721A
Cited
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 |