US2498220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope auxiliary stage with electrodes
Assignee: MITCHEL TYLER Co
•
Filing: 1946-04-17
•
Granted: 1950-02-21
•
Expires: 1966-04-17
Abstract
No abstract record available.
Inventors
- 👤 Harold M Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:28
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/24; G02B21/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587138A
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US628373A
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US1115902A
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US1144941A
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US1198116A
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US1449148A
Cited
US2351282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |