Patent US3210539A successfully refreshed from Google Patents.
US3553789A
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US
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Molding apparatus
Assignee: Dunlop Co Ltd
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Filing: 1968-11-06
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Granted: 1971-01-12
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Expires: 1988-11-06
Abstract
Abstract A PNEUMATIC TIRE MOLD COMPRISING A PLURALITY OF TREAD MOLDING SEGMENTS ARRANGED BETWEEN TWO MOLD HALVES, THE SEGMENTS BEING PIVOTALLY ATTACHED TO ONE OF THE TWO HALVES AND MOVABLE RADIALLY APART ON OPENING THE MOLD UNDER THE INFLUENCE OF SPRING MEMBERS, ONE MEMBER FOR EACH SEGMENT. THE SPRING MEMBERS EACH COMPRISE A PLURALITY OF CO-AXIALLY ARRANGED DISHED ANNULI COMPRESSIBLE TO TEND TO FLATTEN THE FORM OF THE ANNULI AND TO PROVIDE A COMPARATIVELY LARGE FORCE, SUFFICIENT TO BREAK THE ADHESION BETWEEN THE TREAD RUBBER OF THE TIRE AND THE MOLDING SEGMENTS.
Inventors
- 👤 Bernard C Allitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:28
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0606; B29D30/0629; B29D2030/0607; B29D2030/0618
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |