US3428815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distance measuring system using infrared ring-around oscillator with a reference loop having a light conducting rod
Assignee: ELECTRONIC IND ENG Inc
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Filing: 1965-10-22
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Granted: 1969-02-18
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 John R Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:00
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G01S17/32; G01S1/00; G01S1/02; G01S7/00; G01S7/48; G01S7/497
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |