US3381135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Density measuring system having optical wedge to vary length of light path
Assignee: Milton Roy LLC
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Filing: 1964-07-01
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Granted: 1968-04-30
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Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 John D Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/251; G01N21/31; G01N21/314; G01N2021/1748; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A DOUBLE BEAM SPECTROPHOTOMETER COMPRISING MEANS PRODUCING A REFERENCE RADIATION BEAM, MEANS PRODUCING A TEST RADIATION BEAM, MEANS PLACING A MATERIAL OF KNOWN CONCENTRATION IN SAID REFERENCE BEAM, MEANS PLACING A TEST SAMPLE IN SAID TEST BEAM AND ADJUSTABLY PLACING AN OPTICAL WEDGE OF THE MATERIAL OF KNOWN CONCENTRATION IN SAID TEST BEAM, A PHOTOSENSOR SENSING AND GENERATING ELECTRICAL SIGNALS RESPONSIVE TO THE INTENSITY OF SAID REFERENCE BEAM AND SAID TEST BEAM SUBSEQUENT TO PASSING THROUGH SAID MATERIALS, MOTOR MEANS CONNECTED TO SAID WEDGE AND RECEIVING SAID ELECTRICAL SIGNALS TO ADJUSTABLY MOVE SAID WEDGE TO AN OPTICAL NULL POSITION IN SAID TEST BEAM.
Claim 2
Dependent Claim
103 words
A DOUBLE BEAM SPECTROPHOTOMETER COMPRISING MEANS PRODUCING A REFERENCE RADIATION BEAM, MEANS PRODUCING A TEST RADIATION BEAM, MEANS PLACING A MATERIAL OF KNOWN CONCENTRATION IN SAID REFERENCE BEAM, MEANS PLACING A TEST SAMPLE IN SAID TEST BEAM AND ADJUSTABLY PLACING AN OPTICAL WEDGE OF THE MATERIAL OF KNOWN CONCENTRATION IN SAID TEST BEAM, A PHOTOSENSOR SENSING AND GENERATING ELECTRICAL SIGNALS RESPONSIVE TO THE INTENSITY OF SAID REFERENCE BEAM AND SAID TEST BEAM SUBSEQUENT TO PASSING THROUGH SAID MATERIALS, MOTOR MEANS CONNECTED TO SAID WEDGE AND RECEIVING SAID ELECTRICAL SIGNALS TO ADJUSTABLY MOVE SAID WEDGE TO AN OPTICAL NULL POSITION IN SAID TEST BEAM.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |