US3379221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground conduit
Assignee: Armco Inc
•
Filing: 1965-12-28
•
Granted: 1968-04-23
•
Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 William R Harry
- 👤 Ewing Lloyd
- 👤 Ralmond J Smiltneek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:54
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/18; F16L9/12; F16L9/127; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US353680A
Cited
GB113689A
Cited
US1677714A
Cited
US2243273A
Cited
US2991808A
Cited
US3042080A
Cited
US3167204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |