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Patent US2657703A successfully refreshed from Google Patents.
US2657703A
Expired / Lapsed
US
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Isolating tube
Assignee: Individual
•
Filing: 1950-02-24
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Granted: 1953-11-03
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Expires: 1970-02-24
Abstract
No abstract record available.
Inventors
- 👤 Bletcher Ralph Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:18
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/102; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/7287; Y10T137/7358; Y10T137/7439; Y10T137/7462; Y10T137/8593; Y10T137/86292; Y10T137/86324; Y10T137/86332; Y10T137/86348; Y10T137/86372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2195797A
Cited
US2240904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |