US4594790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole surveying employing ring laser gyroscope
Assignee: Applied Technology Associates Inc
•
Filing: 1982-09-20
•
Granted: 1986-06-17
•
Expires: 2002-09-20
Abstract
Abstract A borehole mapping apparatus which employs a ring laser gyroscope. The path of the laser is defined by looping paths of laser beam travel having long and short stretches of travel. The ratio of the stretches being substantially greater than two.
Inventors
- 👤 Harold J. Engebretson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:57
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/083; H01S3/0835
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
In borehole mapping apparatus, the combination comprising (a) a first ring laser gyroscope sized for travel in a direction lengthwise of and within the hole, the laser gyroscope characterized by two laser beams traveling along looping paths in opposite directions, and (b) means mounting said gyroscope for travel in the hole and for rotation about an axis extending generally in said direction, each looping path having long and short stretches, the long stretches extending generally in the direction of the borehole, each short stretch extending generally transversely of the borehole, the ratio of the length of a long stretch to the length of a short stretch being substantially greater than 2.
Claim 2
Dependent Claim
111 words
In borehole mapping apparatus, the combination comprising (a) a first ring laser gyroscope sized for travel in a direction lengthwise of and within the hole, the laser gyroscope characterized by two laser beams traveling along looping paths in opposite directions, and (b) means mounting said gyroscope for travel in the hole and for rotation about an axis extending generally in said direction, each looping path having long and short stretches, the long stretches extending generally in the direction of the borehole, each short stretch extending generally transversely of the borehole, the ratio of the length of a long stretch to the length of a short stretch being substantially greater than 2.
References Cited (Backward Citations)
US2309905A
Cited
US2681657A
Cited
US2674049A
Cited
US2635349A
Cited
US2806295A
Cited
US3037295A
Cited
US3137077A
Cited
US3241363A
Cited
US3052029A
Cited
US3308670A
Cited
US3535040A
Cited
US3563662A
Cited
US3561129A
Cited
US3753296A
Cited
US3894341A
Cited
US4244116A
Cited
US4197654A
Cited
US4199869A
Cited
US4265028A
Cited
US4433491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |