Patent US3158907A successfully refreshed from Google Patents.
US3158907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient split core and shell for moulding apparatus
Assignee: Individual
•
Filing: 1962-11-14
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Granted: 1964-12-01
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Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Strahinja S Pavicevic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:01
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/44; B29C43/00; B29C43/02; B29C43/10; B29C43/12; Y; Y10; Y10S; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A MOULD FOR PRODUCING REINFORCED PLASTIC TUBES AND THE LIKE COMPRISING A SHELL AND A CORE WITHIN THE SHELL, AND MENS FOR CLOSING THE ENDS OF BOTH THE SHELL AND THE CORE IN FLUID-TIGHT MANNER, WHEREIN THE CORE IS FORMED BY A SINGLE LONGITUDINALLY SPLIT RESILIENT EXPANSIBLE TUBE WHOSE LONGITUDINAL EDGES OVERLAP TO AN EXTENT SUFFICIENT TO ALLOW THE TUBE TO EXPAND AT LEAST TO ITS NORMAL WORKING LIMIT OF DIAMETER WITHOUT REDUCTION OF THE EXTENT OF OVERLAP BELOW A SAFE MINIMUM AT WHICH THE TUBE CONTINUES TO PRESENT AN EFFECTIVELY CONTINUOUS CYLINDIRCAL OUTER SURFACE UNDER WORKING CONDITION, MEANS FOR INTRODUCING A FLUID UNDER PRESSURE INTO THE INTERIOR OF THE CORE TUBE, AND A LOW FRICTION FLUID PRESSURE SEAL INSERTED BETWEEN THE OVERLAPPING PORTIONS OF THE RESILIENT CORE TUBE.
Claim 2
Dependent Claim
129 words
A MOULD FOR PRODUCING REINFORCED PLASTIC TUBES AND THE LIKE COMPRISING A SHELL AND A CORE WITHIN THE SHELL, AND MENS FOR CLOSING THE ENDS OF BOTH THE SHELL AND THE CORE IN FLUID-TIGHT MANNER, WHEREIN THE CORE IS FORMED BY A SINGLE LONGITUDINALLY SPLIT RESILIENT EXPANSIBLE TUBE WHOSE LONGITUDINAL EDGES OVERLAP TO AN EXTENT SUFFICIENT TO ALLOW THE TUBE TO EXPAND AT LEAST TO ITS NORMAL WORKING LIMIT OF DIAMETER WITHOUT REDUCTION OF THE EXTENT OF OVERLAP BELOW A SAFE MINIMUM AT WHICH THE TUBE CONTINUES TO PRESENT AN EFFECTIVELY CONTINUOUS CYLINDIRCAL OUTER SURFACE UNDER WORKING CONDITION, MEANS FOR INTRODUCING A FLUID UNDER PRESSURE INTO THE INTERIOR OF THE CORE TUBE, AND A LOW FRICTION FLUID PRESSURE SEAL INSERTED BETWEEN THE OVERLAPPING PORTIONS OF THE RESILIENT CORE TUBE.
References Cited (Backward Citations)
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US861106A
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US935529A
Cited
US1552064A
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US1757487A
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US2628402A
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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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |