US3878018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing stamping blanks
Assignee: Cebal GP
•
Filing: 1972-06-16
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Granted: 1975-04-15
•
Expires: 1992-06-16
Abstract
Abstract The preparation of blanks from which stampings are formed by forming a sandwich of at least two foils, at least one of which is a thermoplastic material and in which the foils are adhered one to the other at least temporarily only in the regions from which the stamping blanks are to be formed to enable the blanks to be cut out while leaving the remainder free for separation and recovery to prevent waste.
Inventors
- 👤 Jean Cospen
- 👤 Bernard Baumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:23
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/20; B29; B29C; B29C51/00; B29C51/14; B32B15/04; B32B15/08; B32B15/082; B32B15/085; B32B15/088; B32B27/00; B32B27/28; B32B27/281; B32B27/30; B32B27/304; B32B27/32; B32B27/34; B32B38/00; B32B38/0004; B32B38/12; B29K; B29K2705/00; B29K2705/02; B29L; B29L2009/00; B29L2009/001; B29L2009/003; B32B2305/00; B32B2305/08; B32B2311/00; B32B2311/16; B32B2311/20; B32B2311/24; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2327/00; B32B2327/06; B32B2377/00; B32B2379/00; B32B2379/08; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/108; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49906; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
IN A METHOD FOR THE MANUFACTURE OF STAMPING BLANKS FORMED OF AT LEAST TWO CONTINUOUS FOILS, AT LEAST ONE OF WHICH IS A FOIL OF A THERMOPLASTIC MATERIAL, AND AT LEAST ONE OF WHICH IS A METAL FOIL, WHEREIN THE PORTION OF THE FOILS FORMING THE BLANK ARE AT LEAST TEMPORARILY ADHERED ONE TO THE OTHER WHILE THE PORTION OF THE FOILS OUTSIDE THE BLANK ARE SEPARABLE ONE FROM THE OTHER ENABLE RECOVERY, COMPRISING PREHEATING THE THERMOPLASTIC FOIL IN THE AREA ENTIRELY WITHIN THE BLANK FORMING ZONE, PRESSING THE FOILS TOGETHER CAUSING THE FOILS TO ADHERE TOGETHER AT LEAST TEMPORARILY ONLY IN THOSE PREHEATED REGIONS WITHIN THE BLANK FORMING ZONE AND FROM WHICH THE BLANK IS TO
Claim 2
Dependent Claim
117 words
IN A METHOD FOR THE MANUFACTURE OF STAMPING BLANKS FORMED OF AT LEAST TWO CONTINUOUS FOILS, AT LEAST ONE OF WHICH IS A FOIL OF A THERMOPLASTIC MATERIAL, AND AT LEAST ONE OF WHICH IS A METAL FOIL, WHEREIN THE PORTION OF THE FOILS FORMING THE BLANK ARE AT LEAST TEMPORARILY ADHERED ONE TO THE OTHER WHILE THE PORTION OF THE FOILS OUTSIDE THE BLANK ARE SEPARABLE ONE FROM THE OTHER ENABLE RECOVERY, COMPRISING PREHEATING THE THERMOPLASTIC FOIL IN THE AREA ENTIRELY WITHIN THE BLANK FORMING ZONE, PRESSING THE FOILS TOGETHER CAUSING THE FOILS TO ADHERE TOGETHER AT LEAST TEMPORARILY ONLY IN THOSE PREHEATED REGIONS WITHIN THE BLANK FORMING ZONE AND FROM WHICH THE BLANK IS TO
Claim 3
Dependent Claim
45 words
A method as claimed in claim 1 in which the adhesion is temporary and is effected by heating those regions of the foil(s) of thermoplastic material from which the blanks are to be formed until they become pasty and then pressing all the foils together.
Claim 4
Dependent Claim
73 words
A method as claimed in claim 1, in which the adhesion is permanent and is effected by coating with an adhesive at least one of the adjacent faces of the foils in those regions of the foils from which the blanks are to be formed, heating those regions of the foil(s) of thermoplastic material from which the blanks are to be formed until they become pasty and then pressing all the foils together.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1 in which the foils are bonded together only over those parts of their adjacent surfaces that are to be subjected to severe stress during stamping.
Claim 6
Dependent Claim
36 words
A method as claimed in claim 1 in which, for the stamping of a cylindrically shaped blank, the sandwich is heated before stamping in spaced concentric rings and along radial bridges connecting one ring to another.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |