Patent US3491596A successfully refreshed from Google Patents.
US2612814A
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Differential refractometer
Assignee: EIDP Inc
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Filing: 1948-05-26
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Granted: 1952-10-07
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Expires: 1968-05-26
Abstract
No abstract record available.
Inventors
- 👤 Leo G Glasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:31
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/4133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1905251A
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US2114867A
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US2136682A
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US2139474A
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US2385503A
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US2427996A
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US2413208A
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US2483102A
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US2445044A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |