US4738390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic closure device for envelope or the like
Assignee: Individual
•
Filing: 1986-02-03
•
Granted: 1988-04-19
•
Expires: 2006-02-03
Abstract
Abstract A repetitively reusable envelope closure arrangement including a pair of thin magnetic plastic patches attached by a cementing agent to at least one portion of the foldable flap of the envelope and to at least one corresponding portion of the envelope body in contact therewith such that the flap is magnetically secured in a closure position. In an alternative embodiment, finely powdered magnetic material having a high order of magnetic retentivity is magnetized in the fluid medium of a standard gum and applied to at least one of the aforementioned envelope flap and body portions and a similar mixture of low retentivity magnetic material particles in gum is applied to the corresponding mating flap or body portion to effect a magnetically secured closure.
Inventors
- 👤 Gerald P. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:19
CPC Classifications
B; B65; B65D; B65D27/00; B65D27/12; B65D2313/00; B65D2313/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/80; Y10; Y10S; Y10S206/00; Y10S206/818
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A reusable paper stock envelope having a body portion and a flap foldable over said body poriton to effect closure of the interior of said envelope, comprising: a first magnetic patch set including at least one magnetic patch affixed to the underside of said flap facing said body portion when said flap is folded into said closure position; a second magnetic patch set including at least one magnetic patch affixed to said envelope body portion at a location such as to be overlapped in substantially planar contact with a corresponding magnetic patch of said first set when said flap is folded into said closure position, said magnetic patches of said first and second sets being thin strips of flexible, non-metallic magnetic tape; and adhesive means for affixing said magnetic tape strips to said flap and envelope body.
Claim 2
Dependent Claim
137 words
A reusable paper stock envelope having a body portion and a flap foldable over said body poriton to effect closure of the interior of said envelope, comprising: a first magnetic patch set including at least one magnetic patch affixed to the underside of said flap facing said body portion when said flap is folded into said closure position; a second magnetic patch set including at least one magnetic patch affixed to said envelope body portion at a location such as to be overlapped in substantially planar contact with a corresponding magnetic patch of said first set when said flap is folded into said closure position, said magnetic patches of said first and second sets being thin strips of flexible, non-metallic magnetic tape; and adhesive means for affixing said magnetic tape strips to said flap and envelope body.
Claim 3
Dependent Claim
53 words
The combination according to claim 1 in which said first and second magnetic patch sets each comprise plural strips of said magnetic tape, said strips of said first set each overlapping a corresponding one of said strips of said second set in planar contact when said flap is folded into said closure position.
Claim 4
Dependent Claim
39 words
The combination according to claim 2 in which each magnetic strip of one of said sets comprises a strip of permanently magnetized tape and the corresponding strip of the other set comprises non-retentive but relatively high permeability magnetic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |