US2501599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric colorimeter
Assignee: Shell Development Co
•
Filing: 1947-11-08
•
Granted: 1950-03-21
•
Expires: 1967-11-08
Abstract
No abstract record available.
Inventors
- 👤 George C Eltenton
- 👤 Marvin B Fallgatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1471342A
Cited
US2299529A
Cited
US2193315A
Cited
US2287322A
Cited
US2301401A
Cited
US2358338A
Cited
US2398904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |