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US2783676A
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Apparatus for determining differences in refractive index
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-07-09
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Granted: 1957-03-05
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Expires: 1972-07-09
Abstract
No abstract record available.
Inventors
- 👤 Keith P Lanneau
- 👤 Elphege M Charlet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:30
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)
US454989A
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US2166824A
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US2157389A
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US2218357A
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US2439373A
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US2483102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |