Patent US3692450A successfully refreshed from Google Patents.
US3692450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of containers
Assignee: Monsanto Chemicals Ltd
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Filing: 1970-10-29
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Granted: 1972-09-19
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Expires: 1990-10-29
Abstract
Abstract A method and apparatus for altering the configuration of a limited portion of a container defining surface of a mold wall after each cycle of a container thermoforming operation, without removing the mold from its place in a machine, so as to prevent successively produced containers from sticking together when stacked or nested.
Inventors
- 👤 Peter Blandford Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:58
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29C51/346; B29C33/00; B29C33/30; B29C33/308
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
An assembly for forming containers from heated sheet material comprising, in combination, a mold having a cavity conforming to the shape of a container, a limited portion of the geometrical surface configuration of said cavity being alterable relative to the remainder thereof, fluid pressure means for forcing successive portions of the sheet into conformity with the surface of the cavity to form the containers, means for ejecting each container from the mold and means operatively synchronized with said fluid pressure means for automatically altering the geometrical surface configuration of said limited cavity surface portion after ejection of each container from the mold.
Claim 2
Dependent Claim
102 words
An assembly for forming containers from heated sheet material comprising, in combination, a mold having a cavity conforming to the shape of a container, a limited portion of the geometrical surface configuration of said cavity being alterable relative to the remainder thereof, fluid pressure means for forcing successive portions of the sheet into conformity with the surface of the cavity to form the containers, means for ejecting each container from the mold and means operatively synchronized with said fluid pressure means for automatically altering the geometrical surface configuration of said limited cavity surface portion after ejection of each container from the mold.
Claim 3
Dependent Claim
21 words
The assembly according to claim 1 wherein the means for altering the geometrical surface configuration includes an electro-pneumatic reciprocable operating mechanism.
Claim 4
Dependent Claim
61 words
The assembly according to claim 1 in which the limited portion of the cavity surface comprises projections formed by a number of discrete lightweight particles randomly arranged in the base of the mold and covered by a flexible diaphragm fitted inside the mold cavity, and including means for changing the arrangement of the particles so that successively produced containers are non-identical.
Claim 5
Dependent Claim
28 words
The assembly of claim 1 wherein the limited portion of the geometrical surface configuration of said cavity surface comprises a reciprocable base having a series of projections thereon.
Claim 6
Dependent Claim
22 words
The assembly according to claim 4, in which the mold has a plurality of spaced alterable limited portions of the cavity surface.
Claim 7
Dependent Claim
14 words
The assembly of claim 4 wherein said projections are assumetrically located on the base.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |