US2650840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter coupling
Assignee: Dresser Industries Inc
•
Filing: 1948-08-03
•
Granted: 1953-09-01
•
Expires: 1968-08-03
Abstract
No abstract record available.
Inventors
- 👤 Roger E Risley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:49
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US784416A
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US1371632A
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US1588444A
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US2105022A
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US2108848A
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US2197450A
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US2145645A
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US2273154A
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US2445151A
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US2588573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |