US3664574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Egg carton
Assignee: WR Grace and Co
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Filing: 1970-06-29
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Granted: 1972-05-23
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Expires: 1990-06-29
Abstract
Abstract THIS INVENTION RELATES TO MOLDED, FOAMED PLASTIC EGG CARTONS WITH ELLIPTICAL CELLS WHICH PREVENT THE EGGS STORED THEREIN FROM CONTACTING EACH OTHER. A LOCKING FLAP PIVOTALBY ATTACHED ALONG ONE EDGE OF THE CARTION INCLUDES LOCKING LUGS WHICH MATE WITH COMPLEMENTARY APERATURE FORMED IN THE COVER TO FIRMLY HOLD THE COVER IN ITS CLOSED POSITION.
Inventors
- 👤 David L Pearl
- 👤 John G Waller
- 👤 Beverly P Head Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:58
CPC Classifications
B; B65; B65D; B65D85/00; B65D85/30; B65D85/32; B65D85/324
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |