Patent US1637348A successfully refreshed from Google Patents.
US1637348A
Expired / Lapsed
US
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Vertical illuminator for microscopes
Assignee: SPENCER LENS CO
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Filing: 1924-10-13
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Granted: 1927-08-02
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Expires: 1944-10-13
Abstract
No abstract record available.
Inventors
- 👤 Harry G Ott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:02
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-08-01 | 1931-01-31 | 1931-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-01 | 1935-01-31 | 1935-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-01 | 1939-01-31 | 1939-08-02 | $7700.00 | Window Closed / Lapsed |