US3616494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching apparatus for rotational molding of plastics materials
Assignee: Individual
•
Filing: 1970-01-20
•
Granted: 1971-11-02
•
Expires: 1990-01-20
Abstract
Abstract THE APPARATUS IS CONSTRUCTED SO THAT THE MOLD IS ROTATED WHILE THE MOLD HOLDER IS ALSO ROTATED. IN THE WAY, PLASTIC MATERUAL WHICH IS CONTAINED WITHIN THE MOLD IS ALLOWED TO UNIFORMLY COAT THE INSIDE SURFACES OF THE MOLD AND TO SOLIDIFY INTO THE SHAPE OF THE MOLD. A HOLLOW MOLDED PLASTIC STRUCTURE IS THUS OBTAINED UNDER GRAVITY FORCES.
Inventors
- 👤 Howard Natter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/06; Y; Y10; Y10S; Y10S425/00; Y10S425/057
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |