US3452163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical phonograph apparatus with polarized light
Assignee: PHILLIP B DAHLEN
•
Filing: 1965-12-08
•
Granted: 1969-06-24
•
Expires: 1985-12-08
Abstract
No abstract record available.
Inventors
- 👤 Phillip B Dahlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
G; G11; G11B; G11B7/00; G11B11/00; G11B11/16; G11B11/18; G11B7/002; G11B7/0037; G11B7/08; G11B7/09; G11B7/0901; G11B7/12; G11B7/14; H; H04; H04N; H04N5/00; H04N5/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1916973A
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US1967882A
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US2654810A
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US2691736A
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US3138669A
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DE1147664B
Cited
US3325603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |