US2861822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter type pipe coupling with separable parking follower
Assignee: Dresser Industries Inc
•
Filing: 1953-06-25
•
Granted: 1958-11-25
•
Expires: 1973-06-25
Abstract
No abstract record available.
Inventors
- 👤 Roger E Risley
- 👤 Robert N Paterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:25
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US471436A
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US1196785A
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US1417492A
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US1479650A
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GB290661A
Cited
US1926422A
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US2009744A
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US2087752A
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GB655866A
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US2701730A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |