Patent US3649728A successfully refreshed from Google Patents.
US3649728A
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Method for molding thermoplastic articles having through-holes therein
Assignee: Panasonic Holdings Corp
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Filing: 1969-07-25
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Granted: 1972-03-14
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Expires: 1989-07-25
Abstract
Abstract A method for producing a shaped article of thermo-plastic material by molding said shaped article by injection molding and thereafter forming a hole or holes in said shaped article by punching, in which the punching is effected within the mold, immediately after the injection molding of the shaped article has been completed but before the shaped article is completely solidified, by a punching mechanism incorporated in the injection molding machine used, whereby formation of a weld-line in the shaped article is prevented and the production efficiency of the shaped article is promoted.
Inventors
- 👤 Norihisa Honsho
- 👤 Satoshi Yasuda
- 👤 Tamotsu Wakahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:24
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C45/5675; B29C33/00; B29C33/0033; B29C43/00; B29C43/32; B29C43/36; B29C43/40; B29C2043/3272; B29C2043/3283; B29C43/361; B29C2043/3615; B29C2043/3618; B29C33/20
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |