Patent US2750796A successfully refreshed from Google Patents.
US2750796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring variable conditions in bore-holes
Assignee: H Maihak AG
•
Filing: 1951-05-31
•
Granted: 1956-06-19
•
Expires: 1971-05-31
Abstract
No abstract record available.
Inventors
- 👤 Knoll Werner
- 👤 Biedendieck Carl Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:34
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; Y; Y10; Y10S; Y10S73/00; Y10S73/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
APPARATUS FOR MEASURING TEMPERATURE IN A BORE-HOLE WHICH COMPRISES A MEMBER HAVING A COEFFICIENT OF HEAT EXPANSION DIFFERENT FROM STEEL, A STEEL WIRE TENSIONED IN SAID MEMBER AND ADAPTED TO BE VARIED IN TENSION BY VARIATION IN THE EXPANSION OF SAID MEMBER, AN ELECTROMAGNET LOCATED CLOSE TO SAID WIRE AND ADAPTED TO EXCITE THE SAID WIRE TO OSCILLATE AT ITS NATURAL FREQUENCY AS DETERMINED BY ITS TENSION AN TO CONVERT THE OSCILLATIONS INTO ELECTRICAL OSCILLATIONS, MEANS FOR TRANSMITTING SAID ELECTRICAL OSCILLATIONS, TO THE SURFACE OF THE BORE-HOLE AND MEANS FOR MEASURING THE FREQUENCY OF SUCH OSCILLATIONS.
Claim 2
Dependent Claim
96 words
APPARATUS FOR MEASURING TEMPERATURE IN A BORE-HOLE WHICH COMPRISES A MEMBER HAVING A COEFFICIENT OF HEAT EXPANSION DIFFERENT FROM STEEL, A STEEL WIRE TENSIONED IN SAID MEMBER AND ADAPTED TO BE VARIED IN TENSION BY VARIATION IN THE EXPANSION OF SAID MEMBER, AN ELECTROMAGNET LOCATED CLOSE TO SAID WIRE AND ADAPTED TO EXCITE THE SAID WIRE TO OSCILLATE AT ITS NATURAL FREQUENCY AS DETERMINED BY ITS TENSION AN TO CONVERT THE OSCILLATIONS INTO ELECTRICAL OSCILLATIONS, MEANS FOR TRANSMITTING SAID ELECTRICAL OSCILLATIONS, TO THE SURFACE OF THE BORE-HOLE AND MEANS FOR MEASURING THE FREQUENCY OF SUCH OSCILLATIONS.
References Cited (Backward Citations)
US1991658A
Cited
US2190260A
Cited
US2306137A
Cited
US2380520A
Cited
US2604787A
Cited
US2447816A
Cited
US2447817A
Cited
US2466809A
Cited
US2646680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |