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US3620876A
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Liquid electromagnetic adhesive and method of joining materials thereby
Assignee: EMABOND Inc 49 WALNUT STREET NORWOOD NEW JERSEY 07648 A DE CORP
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Filing: 1969-07-28
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Granted: 1971-11-16
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Expires: 1989-07-28
Abstract
Abstract Liquid electromagnetic adhesive comprised of a liquid dispersion of a thermoplastic material and noncorrosive ferromagnetic particles having mesh sizes of from 20-200 mesh. The adhesives are employed to bond thermoplastics by the use of inductive heating, the bonding being effected in periods of less than 2 minutes.
Inventors
- 👤 Richard J Guglielmo Sr
- 👤 Nishan G Chookazian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:47
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1425; B29C65/34; B29C65/36; B29C65/3604; B29C65/3608; B29C65/3612; B29C65/3672; B29C65/3676; B29C65/368; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/4855; B29C65/4865; B29C65/487; B29C65/4875; B29C65/4885; B29C65/489; B29C66/00; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/9161; B29C66/91651; B29C66/919; B29C66/9192; B29C66/91921; B29C66/94; B29C66/949; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/127; C09; C09J; C09J5/00; C09J5/06; B29C65/52; B29C65/522; B29C65/526; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
39 words
The method as defined in claim 1 wherein the weight ratio of ferromagnetic particles passing through a 20 mesh screen and not passing through a 200 mesh screen to thermoplastic material is from about 1.1 to about 2:1 .
Claim 2
Dependent Claim
23 words
The method as defined in claim 2 wherein the thermoplastic material is selected from the group consisting of polyolefins, polystyrenes, polyamides and acetals.
Claim 3
Dependent Claim
49 words
The method as defined in claim 3 wherein the ferromagnetic particle is a member selected from the group consisting of nickel, noncorrosive alloys of nickel and iron, noncorrosive alloys of nickel and chromium, noncorrosive alloys of manganese and iron, noncorrosive alloys of cobalt and iron and noncorrosive stainless steels.
Claim 4
Dependent Claim
15 words
The method as defined in claim 4 wherein the liquid dispersion is an aqueous dispersion.
Claim 5
Dependent Claim
42 words
The method of sealably joining opposed sections of untreated nonconducting thermoplastic material as claimed in claim 1 in which ferromagnetic particles are of a particle size which pass through a 40 mesh screen and do not pass through a 100 mesh screen.
Claim 6
Dependent Claim
23 words
The method as defined in claim 5 wherein the interposed bonding layer is dried by evaporation of water prior to the inductive heating.
Claim 7
Dependent Claim
33 words
The method as defined in claim 2 wherein the electromagnetic field has a field intensity of from about 1 to about 30 kilowatts and a frequency from about 5 to about 30 megacycles.
Claim 8
Dependent Claim
37 words
The method of sealably joining opposed sections of untreated nonconducting thermoplastic material as claimed in claim 2 in which the electromagnetic field is terminated after a heating time of from about 1 second to about 30 seconds.
Claim 9
Dependent Claim
38 words
The method as defined in claim 1 wherein the ferromagnetic particle is a member selected from the group consisting of nickel, noncorrosive alloys containing a member selected from the group consisting of nickel, cobalt, iron and mixtures thereof.
Claim 10
Dependent Claim
50 words
The method of sealably joining opposed sections of untreated nonconducting thermoplastic material as claimed in claim 10 in which the ratio of ferromagnetic particles to thermoplastic in the bonding layer is about 1 part to about 2 parts by weight of ferromagnetic particles per 1 part by weight of thermoplastic.
Claim 11
Dependent Claim
69 words
A liquid electromagnetically activatable adhesive composition, comprising a liquid dispersion of thermoplastic materiaL and ferromagnetic particles, said ferromagnetic particles being of a particle size which pass through a 20 mesh screen and do not pass through a 200 mesh screen, whereby upon application of an induced electromagnetic field said particles are rapidly heatable by hysteresis and eddy current effects to a temperature above the Curie temperature of said particles.
Claim 12
Dependent Claim
40 words
The adhesive composition as defined in claim 12 wherein the weight ratio of ferromagnetic particles passing through a 20 mesh screen and not passing through a 200 mesh screen to thermoplastic material is from about 1:1 to about 2:1 .
Claim 13
Dependent Claim
39 words
The adhesive composition as defined in claim 13 wherein the ferromagnetic particles is a member selected from the group consisting of nickel, noncorrosive alloys containing a member selected from the group consisting of nickel, cobalt, iron and mixtures thereof.
Claim 14
Dependent Claim
32 words
The adhesive as defined in claim 14 wherein the ferromagnetic particles are of a particle size which pass through a 40 mesh screen and do not pass through a 100 mesh screen.
Claim 15
Dependent Claim
24 words
The adhesive composition as defined in claim 13 wherein the thermoplastic material is selected from the group consisting of polyolefins, polystyrenes, polyamides and acetals.
Claim 16
Dependent Claim
50 words
The adhesive composition as defined in claim 16 wherein the ferromagnetic particles is a member selected from the group consisting of nickel, noncorrosive alloys of nickel, and iron, noncorrosive alloys of nickel and chromium, noncorrosive alloys of manganese and iron, noncorrosive alloys of cobalt and iron and noncorrosive stainless steels.
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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) | 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 |