US3218942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole cover construction
Assignee: GUSS- und ARMATURWERK KAISERSLAUTERN NACHF KARL BILLAND Firma
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Filing: 1962-06-05
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Granted: 1965-11-23
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Expires: 1982-06-05
Abstract
No abstract record available.
Inventors
- 👤 Raquet Armin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:23
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/14; G; G09; G09F; G09F3/00; G09F3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A MANHOLE COVER CONSTRUCTION COMPRISING A SUPPORTING FRAME PRESENTING A SEATING SURFACE, A MANHOLE COVER HAVING A CIRCUMFERENTIAL RIM PORTION IN REGISTER WITH SAID SEATING SURFACE, A PLURALITY OF PROTUBERANCE SUBSTANTIALLY EQUIDISTANTIALLY SPACED ON SAID RIM PORTION AND DEPENDING THEREFROM, EACH PROTUBERANCE HAVING A FREE END SURFACE AND INCLINED SIDES, SAID SEATING SURFACE HAVING A PLURALITY OF SUBSTANTIALLY EQUIDISTANTIALLY SPACED DEPRESSION, EACH DEPRESSION BEING DEFINED BY A BOTTOM SURFACE AND INCLINED SIDES, THE INCLINED SIDES OF SAID PROTUBERANCES AND SAID DERPESSIONS INCLUDING DIFFERENT ANGLES, WHEREBY SAID PROTUBERANCES UPON ENGAGEMENT IN SAID DEPRESSIONS CONTACT THE SIDES OF SAID DEPRESSIONS ALONG POINTS AND LINES ONLY AND A CLEARANCE IS FORMED BETWEEN SAID END SURFACES AND SAID BOTTOM SURFACE.
Claim 2
Dependent Claim
116 words
A MANHOLE COVER CONSTRUCTION COMPRISING A SUPPORTING FRAME PRESENTING A SEATING SURFACE, A MANHOLE COVER HAVING A CIRCUMFERENTIAL RIM PORTION IN REGISTER WITH SAID SEATING SURFACE, A PLURALITY OF PROTUBERANCE SUBSTANTIALLY EQUIDISTANTIALLY SPACED ON SAID RIM PORTION AND DEPENDING THEREFROM, EACH PROTUBERANCE HAVING A FREE END SURFACE AND INCLINED SIDES, SAID SEATING SURFACE HAVING A PLURALITY OF SUBSTANTIALLY EQUIDISTANTIALLY SPACED DEPRESSION, EACH DEPRESSION BEING DEFINED BY A BOTTOM SURFACE AND INCLINED SIDES, THE INCLINED SIDES OF SAID PROTUBERANCES AND SAID DERPESSIONS INCLUDING DIFFERENT ANGLES, WHEREBY SAID PROTUBERANCES UPON ENGAGEMENT IN SAID DEPRESSIONS CONTACT THE SIDES OF SAID DEPRESSIONS ALONG POINTS AND LINES ONLY AND A CLEARANCE IS FORMED BETWEEN SAID END SURFACES AND SAID BOTTOM SURFACE.
References Cited (Backward Citations)
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GB201018A
Cited
US1859739A
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Cited
US3046853A
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |