US2561243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comparison type densitometer and electronic measuring circuit therefor
Assignee: GAF Chemicals Corp
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Filing: 1946-04-16
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Granted: 1951-07-17
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Expires: 1966-04-16
Abstract
No abstract record available.
Inventors
- 👤 Monroe H Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:39
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/28; G01J1/30
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) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |