Patent US3200698A successfully refreshed from Google Patents.
US3200698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of distance by means of modulated polarized light
Assignee: National Research Development Corp UK
•
Filing: 1961-09-18
•
Granted: 1965-08-17
•
Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 Froome Keith Davy
- 👤 Bradsell Robert Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:47
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
APPARATUS FOR USE IN TESTING WHETHER A LIGHT REFLECTING MEANS IS IN A DESIRED POSITION COMPRISING A BIREFRINGENT CRYSTAL, A LIGHT SOURCE, A POLARIZER FOR EFFECTING PLANE POLARIZATION OF THE LIGHT FROM SAID LIGHT SOURCE IN A PLANE PARALLEL TO THE X OR Y AXIS OF THE CRYSTAL, MEANS FOR APPLYING TO SAID CRYSTAL AN ALTERNATING ELECTRIC FIELD IN THE DIRECTION OF THE Z AXIS OF SAID CRYSTAL, MEANS FOR TRANSMITTING A BEAM OF SAID PLANE POLARIZED LIGHT PARALLEL TO THE Z AXIS OF SAID CRYSTAL AND THROUGH AN ANTINODE OF SAID FIELD AND ONTO THE SAID LIGHT REFLECTING MEANS SAID
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |