Patent US3108442A successfully refreshed from Google Patents.
US3108442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing mine roofs
Assignee: Dayton T Brown Inc
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Filing: 1959-09-30
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Granted: 1963-10-29
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Expires: 1979-09-30
Abstract
No abstract record available.
Inventors
- 👤 Roy G Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A COMBINATION ROOF PROP AND BINDING MATERIAL INJECTOR WHICH COMPRISIES A LOWER ELONGATED PROP PORTION ADAPTED TO BE PLACED AGAINST A SUPPORT SURFACE, AND AN UPPER BINDING MATERIAL INJECTOR PROTION HAVING A NOZZLE END AND AN EXTENSION FLANGE PROVIDED WITH AN UPPER FLANGE SURFACE ADAPTED TO BE INSERTED AGAINST A BORE HOLE WITH SAID UPPER SURFACE IN PRESSURE SEALING ENGAGEMENT WITH THE SURFACE AREA SURROUNDING THE OPENING OF SAID BORE HOLE, AND CONCENTRIC CHANNEL MEANS TERMINATING IN A DUAL NOZZLE MIXING PORTION FORWARD OF SAID FLANGE UPPER SURFACE FOR SEPARATELY INJECTING BINDING MATERIAL AND A CATALYST THERE-
Claim 2
Dependent Claim
97 words
A COMBINATION ROOF PROP AND BINDING MATERIAL INJECTOR WHICH COMPRISIES A LOWER ELONGATED PROP PORTION ADAPTED TO BE PLACED AGAINST A SUPPORT SURFACE, AND AN UPPER BINDING MATERIAL INJECTOR PROTION HAVING A NOZZLE END AND AN EXTENSION FLANGE PROVIDED WITH AN UPPER FLANGE SURFACE ADAPTED TO BE INSERTED AGAINST A BORE HOLE WITH SAID UPPER SURFACE IN PRESSURE SEALING ENGAGEMENT WITH THE SURFACE AREA SURROUNDING THE OPENING OF SAID BORE HOLE, AND CONCENTRIC CHANNEL MEANS TERMINATING IN A DUAL NOZZLE MIXING PORTION FORWARD OF SAID FLANGE UPPER SURFACE FOR SEPARATELY INJECTING BINDING MATERIAL AND A CATALYST THERE-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |