Patent US2727809A successfully refreshed from Google Patents.
Patent US3499668A successfully refreshed from Google Patents.
US3499668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe
Assignee: Youngstown Sheet and Tube Co
•
Filing: 1968-03-11
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Granted: 1970-03-10
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Expires: 1988-03-11
Abstract
No abstract record available.
Inventors
- 👤 Roy H Cullen
- 👤 Charles H Elliott
- 👤 Jimmie R Aker
- 👤 Harvey O Mohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/20; F; F16; F16L; F16L11/00; F16L11/14; F16L11/18
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) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |