Patent US2640716A successfully refreshed from Google Patents.
US2640716A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1948-12-28
•
Granted: 1953-06-02
•
Expires: 1968-12-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:44
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/08; F16L19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2082054A
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US1989674A
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US2211856A
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US2287889A
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US2480496A
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GB576862A
Cited
US2412664A
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US2508763A
Cited
US2536745A
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US2547889A
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US2463707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |