US2807976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractometer
Assignee: ELECTRON MACHINE CORP
•
Filing: 1955-10-11
•
Granted: 1957-10-01
•
Expires: 1975-10-11
Abstract
No abstract record available.
Inventors
- 👤 Carl A Vossberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:15
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1939088A
Cited
US2133106A
Cited
US2278781A
Cited
US2388727A
Cited
US2548154A
Cited
US2529030A
Cited
GB690268A
Cited
US2768553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |