US3620403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic food container
Assignee: Monsanto Co
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Filing: 1969-11-19
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Granted: 1971-11-16
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Expires: 1989-11-19
Abstract
Abstract A thin-walled thermoplastic container which includes identical dish and cover portions, each having a peripherally extending flange for supporting the other when one is placed on the other to form the assembled container. A restraining collar extending from the flange in the direction of the sidewall prevents crosswise displacement in one direction of one portion with respect to the other, while stabilizing posts in the sidewalls prevent such displacement in the opposite direction. Each portion has locking means which coact with the flange of the other and self engage when one portion is forced against the other.
Inventors
- 👤 John H Rump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:22
CPC Classifications
B; B65; B65D; B65D43/00; B65D43/02; B65D43/0202; B65D43/0204; B65D43/0212; B65D2543/00; B65D2543/00009; B65D2543/00018; B65D2543/00064; B65D2543/0012; B65D2543/00157; B65D2543/00259; B65D2543/00296; B65D2543/00342; B65D2543/00351; B65D2543/00444; B65D2543/00481; B65D2543/0049; B65D2543/00527; B65D2543/00537; B65D2543/00592; B65D2543/00601; B65D2543/00611; B65D2543/00648; B65D2543/00675; B65D2543/00685; B65D2543/00712; B65D2543/00722; B65D2543/00731; B65D2543/00787; B65D2543/00814
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
288 words
A two-piece, thin-walled container made of plastic material capable of being thermoformed, said container comprising identical dish and cover portions, said dish and cover portions are triangular in peripheral contour, each of said dish and cover portions having an end wall which is integrally joined at its marginal edge to one end of a sidewall which gradually tapers outwardly away from the end wall, a supporting flange portion extending laterally outwardly at the other end of each sidewall, a restraining collar extending from the outer extremity of the flange portion in the same general direction as the sidewall, a plurality of inwardly directed stabilizing posts spaced from each other and formed along one side of said triangular contour of said cover and dish portions, said stabilizing posts having end sections extending vertically beyond the flange portion, locking means in the restraining collar of each identical dish and cover portion for holding the cover portion vertically in place on the dish portion, said restraining collar extending only one-half way around the periphery including the peripheral sections of the dish and cover portions in which the stabilizing posts are located, whereby said end sections of the stabilizing posts abut against upper sections of the sidewalls on sliding one of said cover and dish portions transversely in one direction with respect to the other and said restraining collar abuts against said flange portion on sliding one of said coVer and dish portions transversely in the opposite direction with respect to the other when said cover portion is mounted on said dish portion such that the flange of the cover portion is supported on the flange of the dish portion with the end walls of each on opposite sides of said flanges.
Claim 2
Dependent Claim
288 words
A two-piece, thin-walled container made of plastic material capable of being thermoformed, said container comprising identical dish and cover portions, said dish and cover portions are triangular in peripheral contour, each of said dish and cover portions having an end wall which is integrally joined at its marginal edge to one end of a sidewall which gradually tapers outwardly away from the end wall, a supporting flange portion extending laterally outwardly at the other end of each sidewall, a restraining collar extending from the outer extremity of the flange portion in the same general direction as the sidewall, a plurality of inwardly directed stabilizing posts spaced from each other and formed along one side of said triangular contour of said cover and dish portions, said stabilizing posts having end sections extending vertically beyond the flange portion, locking means in the restraining collar of each identical dish and cover portion for holding the cover portion vertically in place on the dish portion, said restraining collar extending only one-half way around the periphery including the peripheral sections of the dish and cover portions in which the stabilizing posts are located, whereby said end sections of the stabilizing posts abut against upper sections of the sidewalls on sliding one of said cover and dish portions transversely in one direction with respect to the other and said restraining collar abuts against said flange portion on sliding one of said coVer and dish portions transversely in the opposite direction with respect to the other when said cover portion is mounted on said dish portion such that the flange of the cover portion is supported on the flange of the dish portion with the end walls of each on opposite sides of said flanges.
Claim 3
Dependent Claim
13 words
The container of claim 1 wherein the plastic material is transparent, oriented polystyrene.
Claim 4
Dependent Claim
35 words
The container of claim 1 wherein each end of the restraining collar at its joint with the supporting flange portion tapers gradually into said flange portion along a section of the periphery of the container.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |