US2639653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for producing microphotographs having a three-dimensional effect
Assignee: Individual
•
Filing: 1949-04-13
•
Granted: 1953-05-26
•
Expires: 1969-04-13
Abstract
No abstract record available.
Inventors
- 👤 Karl A Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/18; G02B21/20; G02B21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US230320A
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US1311008A
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GB189502118A
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US1056588A
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US1068862A
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US1605016A
Cited
FR762687A
Cited
AT147586B
Cited
US2224775A
Cited
US2351753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |