US2649834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical feed-back densitometer
Assignee: GAF Chemicals Corp
•
Filing: 1946-04-04
•
Granted: 1953-08-25
•
Expires: 1966-04-04
Abstract
No abstract record available.
Inventors
- 👤 Sweet Monroe Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1881336A
Cited
US1973469A
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US2096323A
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US2241557A
Cited
US2245124A
Cited
US2241743A
Cited
US2413706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |