US3198094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety manhole frame and cover
Assignee: Individual
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Filing: 1963-08-20
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Granted: 1965-08-03
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Expires: 1983-08-20
Abstract
No abstract record available.
Inventors
- 👤 Paul A Dunkerley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:20
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/04; E03F5/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A MANHOLE FRAME AND COVER FOR INSTALLATION IN A WELL OF PRESSURE DRAINGE SYSTEM COMPRISING: (A) A MANHOLE FRAME HAVING AN UPWARDLY FACING SEAT FOR AN OUTER MANHOLE COVER AND A DOWNWARDLY FACING SEAT FOR AN INNER MANHOLE COVER; (B) AN INNER MANHOLE COVER HINGEDLY ATTACHED TO SAID MANHOLE FRAME AND MOVABLE BETWEEN A CLOSED POSITION ADJACENT SAID DOWNWARDLY FACING SEAT AND AN OPEN POSITION DEPENDING INTO THE WELL; (C) OPERATING MEANS CONNECTED TO SAID INNER MANHOLE COVER ADAPTED TO SELECTIVELY OPEN AND CLOSE SAID INNER COVER, SAID OPERATING MEANS INCLUDING AN OPERATING LEVER CONNECTED TO SAID MANHOLE FRAME BELOW SAID UPWARD FACING SEAT AND ABOVE SAID MANHOLE FRAME SEAT, SAID LEVER PROJECTING ABOVE SAID MANHOLE FRAME WHEN SAID INNER COVER IS OPEN AND LYING WITHIN SAID MANHOLE FRAME WHEN SAID INNER COVER IS CLOSED; AND (D) AN OUTER MANHOLE COVER RECEIVABLE ON THE UPWARDLY FACING SEAT OF SAID MANHOLE FRAME WHEN SAID OPERATING LEVER LIES WITHIN SAID MANHOLE FRAME.
Claim 2
Dependent Claim
160 words
A MANHOLE FRAME AND COVER FOR INSTALLATION IN A WELL OF PRESSURE DRAINGE SYSTEM COMPRISING: (A) A MANHOLE FRAME HAVING AN UPWARDLY FACING SEAT FOR AN OUTER MANHOLE COVER AND A DOWNWARDLY FACING SEAT FOR AN INNER MANHOLE COVER; (B) AN INNER MANHOLE COVER HINGEDLY ATTACHED TO SAID MANHOLE FRAME AND MOVABLE BETWEEN A CLOSED POSITION ADJACENT SAID DOWNWARDLY FACING SEAT AND AN OPEN POSITION DEPENDING INTO THE WELL; (C) OPERATING MEANS CONNECTED TO SAID INNER MANHOLE COVER ADAPTED TO SELECTIVELY OPEN AND CLOSE SAID INNER COVER, SAID OPERATING MEANS INCLUDING AN OPERATING LEVER CONNECTED TO SAID MANHOLE FRAME BELOW SAID UPWARD FACING SEAT AND ABOVE SAID MANHOLE FRAME SEAT, SAID LEVER PROJECTING ABOVE SAID MANHOLE FRAME WHEN SAID INNER COVER IS OPEN AND LYING WITHIN SAID MANHOLE FRAME WHEN SAID INNER COVER IS CLOSED; AND (D) AN OUTER MANHOLE COVER RECEIVABLE ON THE UPWARDLY FACING SEAT OF SAID MANHOLE FRAME WHEN SAID OPERATING LEVER LIES WITHIN SAID MANHOLE FRAME.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |