Patent US3263580A successfully refreshed from Google Patents.
US3263580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety adaptor for manholes
Assignee: Individual
•
Filing: 1964-05-26
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Granted: 1966-08-02
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Expires: 1984-05-26
Abstract
No abstract record available.
Inventors
- 👤 James G Macmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:56
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A MANHOLE COVER FOR MANHOLES IN ROADWAY OR THE LIKE COMPRISING A FEMALE FITTING FRAME ADAPTED TO BE SURPORTED WITHIN THE MANHOLE WITH ITS UPPER RIM DISPOSED SLIGHTLY BELOW THE SURFACE OF THE ROADWAY; AN INNER PERIPHERAL FLANGE WITHIN THE FRAME DISPOSED SLIGHTLY BELOW THE UPPER RIM THEREOF; A LAMINATED COVER COMPRISING A LOWER METALLIC LAMINATION SEATING UPON SAID FLANGE FLUSH WITH THE UPPER RIM OF THE FRAME, AND AN UPPER NON-METALLIC LAMINATION SECURED TO THE LOWER LAMINATION AND EXTENDING OVER SAID UPPER RIM AND HAVING ITS UPPER FACE
Claim 2
Dependent Claim
89 words
A MANHOLE COVER FOR MANHOLES IN ROADWAY OR THE LIKE COMPRISING A FEMALE FITTING FRAME ADAPTED TO BE SURPORTED WITHIN THE MANHOLE WITH ITS UPPER RIM DISPOSED SLIGHTLY BELOW THE SURFACE OF THE ROADWAY; AN INNER PERIPHERAL FLANGE WITHIN THE FRAME DISPOSED SLIGHTLY BELOW THE UPPER RIM THEREOF; A LAMINATED COVER COMPRISING A LOWER METALLIC LAMINATION SEATING UPON SAID FLANGE FLUSH WITH THE UPPER RIM OF THE FRAME, AND AN UPPER NON-METALLIC LAMINATION SECURED TO THE LOWER LAMINATION AND EXTENDING OVER SAID UPPER RIM AND HAVING ITS UPPER FACE
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |