Patent US2989643A successfully refreshed from Google Patents.
US2989643A
Expired / Lapsed
US
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Infra-red image system
Assignee: Individual
•
Filing: 1952-07-11
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Granted: 1961-06-20
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Expires: 1972-07-11
Abstract
No abstract record available.
Inventors
- 👤 Wayne W Scanlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2225097A
Cited
GB412905A
Cited
US2395099A
Cited
GB582482A
Cited
US2410317A
Cited
US2403066A
Cited
US2544173A
Cited
US2547173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |