US2857803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential refractometer cell
Assignee: Phillips Petroleum Co
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Filing: 1956-03-12
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Granted: 1958-10-28
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Expires: 1976-03-12
Abstract
No abstract record available.
Inventors
- 👤 Marvin E Reinecke
- 👤 Arthur B Broerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/4133; Y; Y10; Y10T; Y10T137/00; Y10T137/2496
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |