US2703722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube coupling with frusto-conical metallic seal
Assignee: Marmac Products Inc
•
Filing: 1951-06-19
•
Granted: 1955-03-08
•
Expires: 1971-06-19
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Christophersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:32
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/04; F16L23/08; F16L23/10; F16L23/16; F16L23/18; F16L23/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US931914A
Cited
US1556745A
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US1721326A
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US1965273A
Cited
US1866160A
Cited
GB518460A
Cited
US2456203A
Cited
US2426423A
Cited
US2541205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |