Patent US3682369A successfully refreshed from Google Patents.
US3682369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel lock
Assignee: Stone Container Corp
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Filing: 1970-01-05
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Granted: 1972-08-08
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Expires: 1990-01-05
Abstract
Abstract A panel lock is provided for securing two paperboard panels in face contact. A notch is provided in the edge of one of the panels, and a generally T-shaped locking tongue is hinged to the other panel along a fold line substantially coinciding with the base of the notch. The locking tongue is folded through the notch so that the cross-bar of the T-shaped tongue lies against the surface of the notched panel most remote from the panel supporting the tongue.
Inventors
- 👤 Eugene H Isakson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/30; B65D5/301; B65D5/302
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
A corrugated paperboard tray including a bottom panel, side panels hinged to the edges of said bottom panel and extending upwardly therefrom and corner flaps hinged to an end of certain of said side panels and folded into face contact with the adjoining side panel, a lock including: a notch in an edge of one of the overlapping panels at each corner of said bottom panel, a generally T-shaped locking tongue hinged to the other of said overlapping panels along a fold line substantially coinciding with the base of the notch, said locking tongue including a stem portion having parallel sides extending through said notch, said stem being of a length greater than the thickness of the corrugated paperboard, and a cross-bar portion engaging the surface of said one overlapping panel opposite that engaged by said other panel, and parallel fold lines extending across said cross-bar portion from the stem portion to the end of said locking tongue portions, said parallel fold lines being substantially aligned with the parallel sides of said stem.
Claim 2
Dependent Claim
173 words
A corrugated paperboard tray including a bottom panel, side panels hinged to the edges of said bottom panel and extending upwardly therefrom and corner flaps hinged to an end of certain of said side panels and folded into face contact with the adjoining side panel, a lock including: a notch in an edge of one of the overlapping panels at each corner of said bottom panel, a generally T-shaped locking tongue hinged to the other of said overlapping panels along a fold line substantially coinciding with the base of the notch, said locking tongue including a stem portion having parallel sides extending through said notch, said stem being of a length greater than the thickness of the corrugated paperboard, and a cross-bar portion engaging the surface of said one overlapping panel opposite that engaged by said other panel, and parallel fold lines extending across said cross-bar portion from the stem portion to the end of said locking tongue portions, said parallel fold lines being substantially aligned with the parallel sides of said stem.
Claim 3
Dependent Claim
175 words
A corrugated paperboard tray including a bottom panel, side panels hinged to the edges of said bottom panel and extending upwardly therefrom and corner flaps hinged to an end of certain of said side panels and folded into face contact with the adjoining side panel, a lock including: a notch in an edge of one of the overlapping panels at each corner of said bottom panel, a generally T-shaped locking tongue hinged to the other of said overlapping panels along a fold line substantially coinciding with the base of the notch, said locking tongue including a stem portion having parallel sides extending through said notch, said stem being of a length greater than the thickness of the corrugated paperboard, and a cross-bar portion engaging the surface of said one overlapping panel opposite that engaged by said other panel, said notch having a base portion substantially equal in width to said stem portion of Said locking tongue and a throat portion above said base portion which is slightly narrower than the width of said stem portion.
Claim 4
Dependent Claim
175 words
A corrugated paperboard tray including a bottom panel, side panels hinged to the edges of said bottom panel and extending upwardly therefrom and corner flaps hinged to an end of certain of said side panels and folded into face contact with the adjoining side panel, a lock including: a notch in an edge of one of the overlapping panels at each corner of said bottom panel, a generally T-shaped locking tongue hinged to the other of said overlapping panels along a fold line substantially coinciding with the base of the notch, said locking tongue including a stem portion having parallel sides extending through said notch, said stem being of a length greater than the thickness of the corrugated paperboard, and a cross-bar portion engaging the surface of said one overlapping panel opposite that engaged by said other panel, said notch having a base portion substantially equal in width to said stem portion of Said locking tongue and a throat portion above said base portion which is slightly narrower than the width of said stem portion.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |