Patent US3206187A successfully refreshed from Google Patents.
US3206187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swinging check curtain
Assignee: Individual
•
Filing: 1962-01-12
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Granted: 1965-09-14
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Expires: 1982-01-12
Abstract
No abstract record available.
Inventors
- 👤 Wilburn C Cagley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:33
CPC Classifications
E; E21; E21F; E21F1/00; E21F1/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
FOR A MINE CHECK CURTAIN, A PORTABLE SUPPORT BEAM ADAPTED TO BE MOUNTED ADJACENT A MINE ROOF, REMOVABLE SUPPORT MEANS COUPLED TO THE ENDS OF SAID BEAM FOR REMOVABLY SUPPORTING SAID BEAM AGAINST A MINE SHAFT ROOF, A PAIR OF CANTILEVERS PIVOTALLY ATTACHED TO THE UNDERSUR-
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GB429468A
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US2276338A
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US2283577A
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US2412871A
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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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |