US2604810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-beam optical system applicable to spectrometers and other instruments
Assignee: CA Parsons and Co Ltd
•
Filing: 1950-03-17
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Granted: 1952-07-29
•
Expires: 1970-03-17
Abstract
No abstract record available.
Inventors
- 👤 Leonard S Backhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:18
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/34; G01J1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE630307C
Cited
US1854132A
Cited
US1746525A
Cited
US1999023A
Cited
GB555408A
Cited
US2458973A
Cited
GB584506A
Cited
US2503165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |