US5446270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heatable composites
Assignee: 3M Co
•
Filing: 1994-01-12
•
Granted: 1995-08-29
•
Expires: 2014-01-12
Abstract
Abstract Composition comprising (a) susceptors having the capability of absorbing microwave energy, said susceptors comprising a particulate substrate substantially non-reflective of microwave energy and a coating capable of absorbing microwave energy, and (b) a matrix substantially non-reflective of microwave energy. Susceptors are typically particles having a thin-film coating thereon. The matrix typically comprises polymeric or ceramic materials that are stable at temperatures conventionally used in microwave cooking. The composition allows reuse of the susceptors, eliminates decline in heating rate, eliminates arcing, allows the heating rate to be controlled, allows overheating to be controlled, and allows formation of microwave heatable composite materials having very low metal content.
Inventors
- 👤 Craig S. Chamberlain
- 👤 Glen Connell
- 👤 Pierre H. LePere
- 👤 Chris A. Minick
- 👤 Charlotte M. Palmgren
- 👤 William C. Tait
- 👤 George F. Vesley
- 👤 Patrick G. Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:54
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; C; C09; C09K; C09K5/00; H; H05; H05B; H05B6/00; H05B6/64; B29; B29C; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1425; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/486; B29C65/52; B29C65/524; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3443; B65D2581/3445; B65D2581/3448; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3474; B65D2581/3475; B65D2581/3479; B65D2581/3486; B65D2581/3494; Y; Y10; Y10S; Y10S99/00; Y10S99/14; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
An article comprising a flowable meltable particle being spheroidal, rod-like or acicular in shape and having a surface, said surface bearing a coating having an electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs sufficient microwave energy to cause said particle to melt and flow.
Claim 2
Dependent Claim
48 words
An article comprising a flowable meltable particle being spheroidal, rod-like or acicular in shape and having a surface, said surface bearing a coating having an electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs sufficient microwave energy to cause said particle to melt and flow.
Claim 3
Dependent Claim
13 words
The article of claim 1, wherein said particle is a hot melt adhesive.
Claim 4
Dependent Claim
14 words
The article of claim 1, wherein said particle is substantially non-reflective of microwave energy.
Claim 5
Dependent Claim
11 words
The article of claim 1, wherein said coating is electrically conductive.
Claim 6
Dependent Claim
10 words
The article of claim 1, wherein said coating is semi-conductive.
Claim 7
Dependent Claim
10 words
The article of claim 1, wherein said coating is inorganic.
Claim 8
Dependent Claim
13 words
The article of claim 1, wherein said particle has a regular geometric shape.
Claim 9
Dependent Claim
65 words
Method of preparing a hot melt adhesive capable of being heated by microwave energy comprising the steps of: (a) preparing susceptors comprising a particle substantially non-reflective of microwave energy, said particle bearing a thin, electrically conductive coating, said coating having a electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs microwave energy, and (b) incorporating the susceptors into a hot-melt adhesive matrix.
Claim 10
Dependent Claim
65 words
Method of preparing a hot melt adhesive capable of being heated by microwave energy comprising the steps of: (a) preparing susceptors comprising a particle substantially non-reflective of microwave energy, said particle bearing a thin, electrically conductive coating, said coating having a electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs microwave energy, and (b) incorporating the susceptors into a hot-melt adhesive matrix.
Claim 11
Dependent Claim
96 words
Method of preparing a susceptor having a capability of absorbing microwave energy, said susceptor comprising a particle substantially non-reflective of microwave energy and a coating capable of absorbing microwave energy comprising the steps of: (a) providing a particle substantially non-reflective of microwave energy, (b) applying a coating having an electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs microwave energy over said particle, said coating having an outer portion, and (c) causing the outer portion of said coating to oxidize sufficiently to change the electrical conductivity of said outer portion of said coating.
Claim 12
Dependent Claim
96 words
Method of preparing a susceptor having a capability of absorbing microwave energy, said susceptor comprising a particle substantially non-reflective of microwave energy and a coating capable of absorbing microwave energy comprising the steps of: (a) providing a particle substantially non-reflective of microwave energy, (b) applying a coating having an electrical resistivity from 1×10 -6 Ohm-cm to 1×10 7 Ohm-cm which absorbs microwave energy over said particle, said coating having an outer portion, and (c) causing the outer portion of said coating to oxidize sufficiently to change the electrical conductivity of said outer portion of said coating.
References Cited (Backward Citations)
US2830162A
Cited
US3585258A
Cited
US3701872A
Cited
US3853612A
Cited
US4057702A
Cited
US4218507A
Cited
US4025159A
Cited
US4190757A
Cited
US4267420A
Cited
US4230924A
Cited
US4641005A
Cited
US4266108A
Cited
US4454403A
Cited
US4362917A
Cited
US4450334A
Cited
US4438179A
Cited
US4852453A
Cited
US4544600A
Cited
US4518651A
Cited
US4640838A
Cited
US4542271A
Cited
US4623565A
Cited
US4618525A
Cited
US4612242A
Cited
US4721738A
Cited
US4800247A
Cited
US5021293A
Cited
US4808780A
Cited
US4906497A
Cited
US4810829A
Cited
US5294763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |