Patent US2828621A successfully refreshed from Google Patents.
US2828621A
Expired / Lapsed
US
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Viscosimeter
Assignee: Individual
•
Filing: 1953-10-28
•
Granted: 1958-04-01
•
Expires: 1973-10-28
Abstract
No abstract record available.
Inventors
- 👤 Rosenberg Hilmer C Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:48
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10; G01N11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1746791A
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US1930629A
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US1836995A
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US2096222A
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DE707041C
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US2137094A
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US2365339A
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US2360546A
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US2410385A
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US2491639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |