US3341910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for moulding concrete pipes having a circumferential recess in the outer spigot end surface
Assignee: Pedershaab Maskinfabrik AS
•
Filing: 1964-11-02
•
Granted: 1967-09-19
•
Expires: 1984-11-02
Abstract
No abstract record available.
Inventors
- 👤 Hesselholt Jens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/76; Y; Y10; Y10S; Y10S425/00; Y10S425/218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
AN APPARATUS FOR MOLDING CONCRETE PIPES HAVING A CIRCUMFERENTIAL RECESS IN THE OUTER SPIGOT END SURFACE, SAID APPARATUS COMPRISING A PROFILE RING FORMING A CORE FOR SAID RECESS; OUTER AND INNER MOLD PARTS DEFINING BETWEEN THEM AN ANNULAR SPACE; A PRESSURE COVER TO CLOSE THE SPIGOT END OF SAID SPACE, SAID PRESSURE COVER COMPISING SEPARATE INNER AND OUTER ANNULAR MEMBERS, SAID OUTER ANNULAR MEMBER COMPLETELY SURROUNDING SAID RING AND SAID INNER ANNULAR MEMBER, AND SAID INNER ANNULAR MEMBER FORMING AN ABUTMENT FOR SAID RING IN THE OPERATIVE POSITIONS OF SAID MEMBERS; AND MEANS TO DISPLACE SAID OUTER ANNULAR MEMBER AXIALLY WITH RESPECT TO SAID INNER ANNULAR MEMBER, SO THAT SAID OUTER ANNULAR MEMBER CAN BE
Claim 2
Independent Claim
115 words
AN APPARATUS FOR MOLDING CONCRETE PIPES HAVING A CIRCUMFERENTIAL RECESS IN THE OUTER SPIGOT END SURFACE, SAID APPARATUS COMPRISING A PROFILE RING FORMING A CORE FOR SAID RECESS; OUTER AND INNER MOLD PARTS DEFINING BETWEEN THEM AN ANNULAR SPACE; A PRESSURE COVER TO CLOSE THE SPIGOT END OF SAID SPACE, SAID PRESSURE COVER COMPISING SEPARATE INNER AND OUTER ANNULAR MEMBERS, SAID OUTER ANNULAR MEMBER COMPLETELY SURROUNDING SAID RING AND SAID INNER ANNULAR MEMBER, AND SAID INNER ANNULAR MEMBER FORMING AN ABUTMENT FOR SAID RING IN THE OPERATIVE POSITIONS OF SAID MEMBERS; AND MEANS TO DISPLACE SAID OUTER ANNULAR MEMBER AXIALLY WITH RESPECT TO SAID INNER ANNULAR MEMBER, SO THAT SAID OUTER ANNULAR MEMBER CAN BE
References Cited (Backward Citations)
US2929124A
Cited
US2871541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |