US2764431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing-head adapter flange
Assignee: Shaffer Tool Works
•
Filing: 1952-12-05
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Granted: 1956-09-25
•
Expires: 1972-12-05
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; F; F16; F16B; F16B2200/00; F16B2200/50; F16B2200/503; F16B2200/506
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US626223A
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US750428A
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GB189414892A
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US696603A
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US1020929A
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US1179091A
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US1389282A
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US1456761A
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US2412418A
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US2461856A
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US2558695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |