Patent US3579140A successfully refreshed from Google Patents.
US3579140A
Expired / Lapsed
US
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Laser
Assignee: Applied Biosystems Inc
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Filing: 1967-12-05
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Granted: 1971-05-18
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Expires: 1987-12-05
Abstract
Abstract A continuous wave laser in which the end mirrors are automatically maintained in alignment. A four-quadrant detector is centered along the path of the emerging light beam. Misalignment of the end mirrors causes an axial shift in the direction of the light beam and produces output signals from the four-quadrant detector from which can be determined the direction and amount of shift. These signals are used to servocontrol the position of one of the mirrors so as to bring it back into alignment with the other mirror.
Inventors
- 👤 James M Anderson
- 👤 Marvin J Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:06
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/139; H01S3/05; H01S3/08; H01S3/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
The apparatus of claim 1 including a diverging lens in axial alignment between the center of said detector and the end mirror defining the adjacent end of the resonant cavity.
Claim 2
Dependent Claim
36 words
The apparatus of claim 1 in which said electronic means comprise one differential amplifier connected to receive the outputs from two of the detectors and another connected to receive the outputs of the other two detectors.
References Cited (Backward Citations)
US3218915A
Cited
US3229099A
Cited
US3252110A
Cited
US3316800A
Cited
US3229224A
Cited
US3359812A
Cited
US3357268A
Cited
US3404352A
Cited
US3428915A
Cited
US3400596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |