US2992021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe connection
Assignee: American Iron & Machine Works
•
Filing: 1958-02-26
•
Granted: 1961-07-11
•
Expires: 1978-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Nay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:57
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US411125A
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US1407335A
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US1517428A
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US2443312A
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US2450453A
Cited
US2511889A
Cited
US2636753A
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US2671949A
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US2746486A
Cited
US2825585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |