US3439157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point light source
Assignee: Singer General Precision Inc
•
Filing: 1966-02-11
•
Granted: 1969-04-15
•
Expires: 1986-02-11
Abstract
No abstract record available.
Inventors
- 👤 Walter E Myles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; F; F21; F21K; F21K2/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1351562A
Cited
US1794557A
Cited
US2408601A
Cited
US2636109A
Cited
US2760185A
Cited
US2942099A
Cited
US3213751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |