US3315313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoforming mold
Assignee: Union Carbide Corp
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Filing: 1965-08-24
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Granted: 1967-04-25
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Expires: 1985-08-24
Abstract
No abstract record available.
Inventors
- 👤 Steigman Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/08; B29C51/082; Y; Y10; Y10S; Y10S425/00; Y10S425/055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN AN APPARATUS FOR THERMOFORMING HOLLOW PLASTIC ARTICLES, SAID APPARATUS HAVING A MOLD WITH A CAVITY THEREIN, A PLUNGER MOUNTED IN REGISTRATION WITH SAID CAVITY, WHICH PLUNGER HAS A LEADING PORTION OF SMALLER DIMENSIONS THAN THE CORRESPONDING WALLS OF SAID CAVITY SO AS TO PROVIDE AN ANNULAR SPACE THEREBETWEEN, SAID LEADING PORTION TERMINTATING IN A PLUNGR HEAD AND BEING ADAPTED TO CONTACT A HEATED PLASTIC SHEET SECURELY POSITIONED BETWEEN SAID PLUNGER AND THE MOLD CAVITY AND DRAW SAID SHEET INTO SAID CAVITY FOR FORMATION OF SAID HOLLOW PLASTIC ARTICLE, THE IMPROVEMENT COMPRISING A CAP AFFIXED TO SAID PLUNGER HEAD AND COVERING A PORTION THEREOF SO AS TO FORM PART OF THE SHEET CONTACTING SURFACE OF SAID HEAD, SAID CAP HAVING A SURFACE OF LESSER COEFFICIENT OF FRICTION THAN THE SURFACE OF SAID HEAD AND BEING OF DIFFERENT MATERIAL THAN SAID HEAD AND SERVING TO REDUCE THE OVERALL COEFFICIENT OF FRICTION OF SAID LEADING PORTION.
Claim 2
Dependent Claim
154 words
IN AN APPARATUS FOR THERMOFORMING HOLLOW PLASTIC ARTICLES, SAID APPARATUS HAVING A MOLD WITH A CAVITY THEREIN, A PLUNGER MOUNTED IN REGISTRATION WITH SAID CAVITY, WHICH PLUNGER HAS A LEADING PORTION OF SMALLER DIMENSIONS THAN THE CORRESPONDING WALLS OF SAID CAVITY SO AS TO PROVIDE AN ANNULAR SPACE THEREBETWEEN, SAID LEADING PORTION TERMINTATING IN A PLUNGR HEAD AND BEING ADAPTED TO CONTACT A HEATED PLASTIC SHEET SECURELY POSITIONED BETWEEN SAID PLUNGER AND THE MOLD CAVITY AND DRAW SAID SHEET INTO SAID CAVITY FOR FORMATION OF SAID HOLLOW PLASTIC ARTICLE, THE IMPROVEMENT COMPRISING A CAP AFFIXED TO SAID PLUNGER HEAD AND COVERING A PORTION THEREOF SO AS TO FORM PART OF THE SHEET CONTACTING SURFACE OF SAID HEAD, SAID CAP HAVING A SURFACE OF LESSER COEFFICIENT OF FRICTION THAN THE SURFACE OF SAID HEAD AND BEING OF DIFFERENT MATERIAL THAN SAID HEAD AND SERVING TO REDUCE THE OVERALL COEFFICIENT OF FRICTION OF SAID LEADING PORTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |