US2463280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectroscope grating having spaced zones of diffraction lines
Assignee: Individual
•
Filing: 1943-02-16
•
Granted: 1949-03-01
•
Expires: 1963-02-16
Abstract
No abstract record available.
Inventors
- 👤 Frank J Kaehni
- 👤 William L Kaehni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:02
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G01; G01J; G01J3/00; G01J3/12; G01J3/18
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-29 | 1952-08-30 | 1953-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-29 | 1956-08-30 | 1957-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-29 | 1960-08-30 | 1961-03-01 | $7700.00 | Window Closed / Lapsed |