US2749572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of shaping thermoplastic sheets
Assignee: Van Brode Milling Co Inc
•
Filing: 1954-02-11
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Granted: 1956-06-12
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Expires: 1974-02-11
Abstract
No abstract record available.
Inventors
- 👤 Roger L Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:12
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29C51/42; B29C51/421; B29C51/422; Y; Y10; Y10S; Y10S220/00; Y10S220/12; Y10S264/00; Y10S264/50; Y10S264/78; Y10S425/00; Y10S425/039
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
THE METHOD OF SHAPING A THERMOPLASTIC SHEET INTO A DEEP-DRAWN CONTAINER HAVING AN OUTWARDLY EXTENDING CURLED TOP EDGE, WHICH CONSISTS IN CLAMPING SAID SHEET ACROSS A TOP CAVITY WHICH SLOPES TOWARD AND CONNECTS WITH A MOLD CAVITY AND HAS FORMED THEREIN AN ANNULAR GROOVE CONCENTRIC WITH AND AROUND THE MOUTH OF SAID MOLD CAVITY, SAID ANNULAR GROOVE BEING SEPARATED FROM SAID MOLD CAVITY BY A RIB THE TOP OF WHICH IS IN ALINEMENT WITH THE SLOPE OF SAID TOP CAVITY, SUBJECTING SAID SHEET TO NON-UNIFORM HEAT TO EFFECT DIFFERENTIAL PLASTICITY IN SAID SHEET, SAID HEAT BEING SO CONTROLLED THAT THE CONDITION OF GREATEST PLASTICITY OF SAID SHEET IS EFFECTED IN THOSE REGIONS THEREOF WHICH LIE OUTSIDE OF THE AREA OF SAID MOLD CAVITY BUT INCLUDE THE AREA OF SAID ANNULAR GROOVE, AND WITHDRAWING AIR FROM BOTH OF SAID CAVITIES WHEREBY SAID SHEET IS MADE TO ASSUME THE CONFORMATION OF SAID CAVITIES.
Claim 2
Independent Claim
151 words
THE METHOD OF SHAPING A THERMOPLASTIC SHEET INTO A DEEP-DRAWN CONTAINER HAVING AN OUTWARDLY EXTENDING CURLED TOP EDGE, WHICH CONSISTS IN CLAMPING SAID SHEET ACROSS A TOP CAVITY WHICH SLOPES TOWARD AND CONNECTS WITH A MOLD CAVITY AND HAS FORMED THEREIN AN ANNULAR GROOVE CONCENTRIC WITH AND AROUND THE MOUTH OF SAID MOLD CAVITY, SAID ANNULAR GROOVE BEING SEPARATED FROM SAID MOLD CAVITY BY A RIB THE TOP OF WHICH IS IN ALINEMENT WITH THE SLOPE OF SAID TOP CAVITY, SUBJECTING SAID SHEET TO NON-UNIFORM HEAT TO EFFECT DIFFERENTIAL PLASTICITY IN SAID SHEET, SAID HEAT BEING SO CONTROLLED THAT THE CONDITION OF GREATEST PLASTICITY OF SAID SHEET IS EFFECTED IN THOSE REGIONS THEREOF WHICH LIE OUTSIDE OF THE AREA OF SAID MOLD CAVITY BUT INCLUDE THE AREA OF SAID ANNULAR GROOVE, AND WITHDRAWING AIR FROM BOTH OF SAID CAVITIES WHEREBY SAID SHEET IS MADE TO ASSUME THE CONFORMATION OF SAID CAVITIES.
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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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |