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US2657487A
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Assignee: Individual
•
Filing: 1949-03-16
•
Granted: 1953-11-03
•
Expires: 1969-03-16
Abstract
No abstract record available.
Inventors
- 👤 Sprung Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:44
CPC Classifications
G; G09; G09B; G09B29/00; G09B29/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1237940A
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US1395509A
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US1461842A
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US1642580A
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US1667967A
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US1833595A
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GB591134A
Cited
US2306634A
Cited
US2513072A
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 |