Patent US4776409A successfully refreshed from Google Patents.
US4091985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking tray
Assignee: Smurfit Kappa Packaging Corp
•
Filing: 1977-11-10
•
Granted: 1978-05-30
•
Expires: 1997-11-10
Abstract
Abstract A paperboard tray has slots and slit extensions formed in the end wall. A lock tab hinged to an end closure flap foldably attached to a side wall is received through said slot and slit extension to interlock the walls of the tray.
Inventors
- 👤 Jay J. Holzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:07
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/30; B65D5/301; B65D5/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A tray formed from a cut and scored blank of paperboard, or the like, comprising: (a) a bottom wall, a pair of side walls hinged to the side edges of said bottom wall, and a pair of end walls hinged to the end edges of said bottom wall; (b) an end closure flap hingedly projecting from an end edge of each of said side walls and being folded to overlap a portion of said end wall; (c) said flap having a lock tab integrally formed therewith and folded approximately normal thereto; (d) a slot formed in each of said end walls and having a slit extension cut in said wall; (e) said lock tab being received in said slot and said slit extension for locking engagement with said end wall thereby securing said walls of said tray together, wherein said slit extension is cut in said end wall immediately above said slot and centrally thereof.
Claim 2
Dependent Claim
155 words
A tray formed from a cut and scored blank of paperboard, or the like, comprising: (a) a bottom wall, a pair of side walls hinged to the side edges of said bottom wall, and a pair of end walls hinged to the end edges of said bottom wall; (b) an end closure flap hingedly projecting from an end edge of each of said side walls and being folded to overlap a portion of said end wall; (c) said flap having a lock tab integrally formed therewith and folded approximately normal thereto; (d) a slot formed in each of said end walls and having a slit extension cut in said wall; (e) said lock tab being received in said slot and said slit extension for locking engagement with said end wall thereby securing said walls of said tray together, wherein said slit extension is cut in said end wall immediately above said slot and centrally thereof.
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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |