US3211051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical measuring device for obtaining a first derivative of intensity with respect to wavelength
Assignee: Individual
•
Filing: 1962-04-27
•
Granted: 1965-10-12
•
Expires: 1982-04-27
Abstract
No abstract record available.
Inventors
- 👤 Frei Jael Fanny
- 👤 Frei Ephraim Heinrich
- 👤 Uri P Oppenheim
- 👤 Claude I Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45; G01J; G01J3/00; G01J3/28; G01J3/42; G01J3/433
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2078768A
Cited
US2444560A
Cited
US2648249A
Cited
US2631489A
Cited
US2941443A
Cited
US2936732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |