US2729143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared optical system
Assignee: Individual
•
Filing: 1950-06-13
•
Granted: 1956-01-03
•
Expires: 1970-06-13
Abstract
No abstract record available.
Inventors
- 👤 John U White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:25
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/26; G01; G01J; G01J3/00; G01J3/12; G02B5/28; G02B5/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |