US2873538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-tight and gas-tight rotating tubular joints
Assignee: ROTHERM ENGINEERING Co IN
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Filing: 1956-07-27
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Granted: 1959-02-17
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Expires: 1976-07-27
Abstract
No abstract record available.
Inventors
- 👤 Ephraim H Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:42
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/54; F16L; F16L39/00; F16L39/04
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) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |