Patent US3389247A successfully refreshed from Google Patents.
US3389247A
Expired / Lapsed
US
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Pendulum light source
Assignee: Individual
•
Filing: 1964-07-01
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Granted: 1968-06-18
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Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 Fay E Null
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:18
CPC Classifications
F; F21; F21S; F21S10/00; F21S10/005; G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0005; G02B6/001; Y; Y10; Y10S; Y10S362/00; Y10S362/806; Y10S362/811
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |