US3104645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bolt stress indicator
Assignee: Individual
•
Filing: 1961-03-22
•
Granted: 1963-09-24
•
Expires: 1981-03-22
Abstract
No abstract record available.
Inventors
- 👤 Harrison Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:07
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A MINE ROOF BOLT ASSEMBLY HAVING AN ELONGATED BOLT WITH AN EXPANSIBLE ANCHORING MEANS AT ITS ONE END ADAPTED FOR INSERTION IN AN UPWARDLY EXTENDING HOLE IN A MINE ROOF WITH THE ANCHORING MEANS END-FOREMOST, THE OTHER END OF SAID BOLT HAVING HEAD MEANS THEREON, A MOUNTING PLATE HAVING A ROOF-ENGAGING SURFACE AND AN APERTURE THERETHROUGH FOR RECEIVING SAID BOLT, A STRESS INDICATOR COMPRISING: FIRST MEANS OPERATIVELY CARRIED BY SAID BOLT RESPONSIVE TO ADVERSE STRESS ON SAID BOLT FOR INDICATING WHEN EXCESSIVE STRESS IS IMPARTED TO THE BOLT; AND A SECOND MEANS POSITIONED ADJACENT SAID FIRST MEANS FOR REDUCING THE CROSS-SECTIONAL AREA OF SAID FIRST MEANS THEREBY PROVIDING THE INDICATION OF EXCESSIVE BOLT STRESS WHEN THE CROSS SECTIONAL AREA OF SAID FIRST MEANS IS SO REDUCED THAT SAID FIRST MEANS IS DEFLECTED DOWNWARD APPRECIABLY.
Claim 2
Dependent Claim
135 words
IN A MINE ROOF BOLT ASSEMBLY HAVING AN ELONGATED BOLT WITH AN EXPANSIBLE ANCHORING MEANS AT ITS ONE END ADAPTED FOR INSERTION IN AN UPWARDLY EXTENDING HOLE IN A MINE ROOF WITH THE ANCHORING MEANS END-FOREMOST, THE OTHER END OF SAID BOLT HAVING HEAD MEANS THEREON, A MOUNTING PLATE HAVING A ROOF-ENGAGING SURFACE AND AN APERTURE THERETHROUGH FOR RECEIVING SAID BOLT, A STRESS INDICATOR COMPRISING: FIRST MEANS OPERATIVELY CARRIED BY SAID BOLT RESPONSIVE TO ADVERSE STRESS ON SAID BOLT FOR INDICATING WHEN EXCESSIVE STRESS IS IMPARTED TO THE BOLT; AND A SECOND MEANS POSITIONED ADJACENT SAID FIRST MEANS FOR REDUCING THE CROSS-SECTIONAL AREA OF SAID FIRST MEANS THEREBY PROVIDING THE INDICATION OF EXCESSIVE BOLT STRESS WHEN THE CROSS SECTIONAL AREA OF SAID FIRST MEANS IS SO REDUCED THAT SAID FIRST MEANS IS DEFLECTED DOWNWARD APPRECIABLY.
References Cited (Backward Citations)
US1774695A
Cited
US2850937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |