US2741497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock coupling
Assignee: Dresser Industries Inc
•
Filing: 1950-08-08
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Granted: 1956-04-10
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Expires: 1970-08-08
Abstract
No abstract record available.
Inventors
- 👤 Roger E Risley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:10
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US459907A
Cited
US1240486A
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US1888260A
Cited
FR42519E
Cited
NL51826C
Cited
US2398399A
Cited
US2531922A
Cited
FR913833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |