Patent US2797758A successfully refreshed from Google Patents.
US2797758A
Expired / Lapsed
US
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Packer unit and packing ring for pipe testing apparatus
Assignee: Individual
•
Filing: 1954-08-17
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Granted: 1957-07-02
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Expires: 1974-08-17
Abstract
No abstract record available.
Inventors
- 👤 Clayton W Showalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1888315A
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US2196668A
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US2241526A
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US2295770A
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US2609836A
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US2652717A
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US2684119A
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US2671510A
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US2741313A
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US2738015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |