Patent US3306100A successfully refreshed from Google Patents.
US3306100A
Expired / Lapsed
US
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Ultrasonic bolt tension tester
Assignee: SKIDMORE WILHELM Manufacturing Co
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Filing: 1964-02-25
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Granted: 1967-02-28
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Expires: 1984-02-25
Abstract
No abstract record available.
Inventors
- 👤 John W Wilhelm
- 👤 Waldo H Kliever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/24; G01L5/246; G01N; G01N29/00; G01N29/04; G01N29/12; F; F16; F16B; F16B31/00; F16B31/02; F16B2031/022; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A TEST INSTRUMENT FOR DETERMINING TENSION IN A BOLT OR LIKE ELEMENT COMPRISING, CIRCUIT MEANS INCLUDING MECHANICAL-ELECTRICAL TRANSDUCER MEANS OPERATIVELY CONNECTED WITH ONE END OF SAID BOLT FOR CAUSING RESONANT VIBRATIONS OF THE BOLT AND FOR GENERATING A FIRST ELECTRICAL SIGNAL HAVING FREQUENCY CHARACTERISTICS CORRESPONDING TO SAID RESONANT VIBRATIONS AND REPRESENTATIVE OF THE LENGTH OF THE BOLT IN A NONSTRESSED CONDITION, SAID CIRCUIT MEANS BEING OPERABLE UPON THE ELONGATION OF SAID BOLT TO PROVIDE A SECOND ELECTRICAL SIGNAL HAVING FREQUENCY CHARACTERISTICS CORRESPONDING TO RESONANT VIBRATIONS OF SAID BOLT AT ITS NEW LENGTH, MEANS FOR PROVIDING AN ELECTRICAL REFERENCE SIGNAL WHICH HAS IDENTICAL FREQUENCY CHARACTERISTICS TO THE FIRST ELECTRICAL SIGNAL, SAID CIRCUIT MEANS INCLUDING FILTER MEANS OPERABLE TO CANCEL SIGNAL COMPONENTS FROM SAID FIRST ELECTRICAL SIGNAL WHICH HAVE FREQUENCY CHARACTERISTICS THAT ARE DISSIMILAR TO THE FREQUENCY CHARACTERISTICS OF SAID BOLT, AND MEANS FOR MIXING SAID SECOND ELECTRICAL SIGNAL AND SAID REFERENCE SIGNAL WHEREBY TO PROVIDE A RESULTANT SIGNAL CORRESPONDING TO THE ELONGATION OF SAID BOLT.
Claim 2
Dependent Claim
164 words
A TEST INSTRUMENT FOR DETERMINING TENSION IN A BOLT OR LIKE ELEMENT COMPRISING, CIRCUIT MEANS INCLUDING MECHANICAL-ELECTRICAL TRANSDUCER MEANS OPERATIVELY CONNECTED WITH ONE END OF SAID BOLT FOR CAUSING RESONANT VIBRATIONS OF THE BOLT AND FOR GENERATING A FIRST ELECTRICAL SIGNAL HAVING FREQUENCY CHARACTERISTICS CORRESPONDING TO SAID RESONANT VIBRATIONS AND REPRESENTATIVE OF THE LENGTH OF THE BOLT IN A NONSTRESSED CONDITION, SAID CIRCUIT MEANS BEING OPERABLE UPON THE ELONGATION OF SAID BOLT TO PROVIDE A SECOND ELECTRICAL SIGNAL HAVING FREQUENCY CHARACTERISTICS CORRESPONDING TO RESONANT VIBRATIONS OF SAID BOLT AT ITS NEW LENGTH, MEANS FOR PROVIDING AN ELECTRICAL REFERENCE SIGNAL WHICH HAS IDENTICAL FREQUENCY CHARACTERISTICS TO THE FIRST ELECTRICAL SIGNAL, SAID CIRCUIT MEANS INCLUDING FILTER MEANS OPERABLE TO CANCEL SIGNAL COMPONENTS FROM SAID FIRST ELECTRICAL SIGNAL WHICH HAVE FREQUENCY CHARACTERISTICS THAT ARE DISSIMILAR TO THE FREQUENCY CHARACTERISTICS OF SAID BOLT, AND MEANS FOR MIXING SAID SECOND ELECTRICAL SIGNAL AND SAID REFERENCE SIGNAL WHEREBY TO PROVIDE A RESULTANT SIGNAL CORRESPONDING TO THE ELONGATION OF SAID BOLT.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |