Patent US2494239A successfully refreshed from Google Patents.
US2494239A
Expired / Lapsed
US
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Mechanical kaleidoscope
Assignee: Individual
•
Filing: 1947-08-02
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Granted: 1950-01-10
•
Expires: 1967-08-02
Abstract
No abstract record available.
Inventors
- 👤 Harlow B Grow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:00
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US174690A
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US183550A
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US495822A
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US1595881A
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US1294967A
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US1414469A
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US1518204A
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GB395796A
Cited
US2066548A
Cited
US2298966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |