Patent US5350302A successfully refreshed from Google Patents.
US5477756A
Expired / Lapsed
US
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Method of applying polymers to razor blade cutting edges
Assignee: Gillette Co LLC
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Filing: 1993-09-22
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Granted: 1995-12-26
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Expires: 2013-09-22
Abstract
Abstract A method of manufacturing a razor blade is disclosed wherein a polymer material is coated onto the blade edge. The polymer material is applied to the blade edge in a coating solution after which the blade is heated to melt the polymer via a radio frequency source, preferably a microwave source.
Inventors
- 👤 Hoang M. Trankiem
- 👤 Manohar S. Grewal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:11
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60; Y; Y10; Y10S; Y10S76/00; Y10S76/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A method of manufacturing a razor blade having a coating of polymeric material disposed on the cutting edge surface thereof which includes the steps of: a) providing a single mode cavity operating in Transverse Electric mode 112 having a non-oxidizing atmosphere therein and a means for delivering microwave enemy having a frequency of from about 300 MHz to about 30 GHz; b) applying a polymeric material to the edge of the blade; and retaining said blade in said cavity whereby the heat induced by said radio frequency energy is effective to raise the temperature of the coated edge surface of said blade and causing said polymeric material to melt, wherein said razor blade edge is positioned perpendicular to or parallel to the electric field and said single mode cavity is tuned to minimize reflected power.
Claim 2
Independent Claim
135 words
A method of manufacturing a razor blade having a coating of polymeric material disposed on the cutting edge surface thereof which includes the steps of: a) providing a single mode cavity operating in Transverse Electric mode 112 having a non-oxidizing atmosphere therein and a means for delivering microwave enemy having a frequency of from about 300 MHz to about 30 GHz; b) applying a polymeric material to the edge of the blade; and retaining said blade in said cavity whereby the heat induced by said radio frequency energy is effective to raise the temperature of the coated edge surface of said blade and causing said polymeric material to melt, wherein said razor blade edge is positioned perpendicular to or parallel to the electric field and said single mode cavity is tuned to minimize reflected power.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein said polymeric material is selected from the group consisting of fluorocarbon polymers, silicone-based polymers or mixtures thereof.
Claim 4
Dependent Claim
15 words
A method according to claim 2 wherein said polymeric material is a polymer of tetrafluoroethylene.
Claim 5
Dependent Claim
19 words
A method according to claim 3 wherein the temperature of the coated edge surface does not exceed 430° C.
Claim 6
Dependent Claim
36 words
A method according to claim 4 wherein step b) the polymeric material is applied to the edge of the blade by dipping or spraying a coating of the polymer dispersed in solvent on said blade edge.
Claim 7
Dependent Claim
26 words
A method according to claim 5 wherein said solvent is selected from the group consisting of water, volatile organic solvents, fluorocarbon solvents or miscible combinations thereof.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein said dispersion is electrostatically sprayed on to said edge surface.
Claim 9
Dependent Claim
17 words
A method according to claim 6 wherein said microwave energy has a frequency of about 2.45 GHz.
Claim 10
Dependent Claim
15 words
A method according to claim 6 wherein said dispersion is preheated prior to step b).
Claim 11
Dependent Claim
28 words
A method according to claim 6 wherein said razor blade is chilled to a temperature of from about 5° C. to about 20° C. prior to step c).
Claim 12
Dependent Claim
26 words
A method according to claim 6 wherein said razor blade is chilled to a temperature of from about 5° C. to 20° C. during step c).
Claim 13
Dependent Claim
23 words
A method according to claim 6 wherein said razor blade is chilled to a temperature of from about 5° C. after step c).
Claim 14
Dependent Claim
28 words
A method according to claim 6 wherein said razor blade is positioned such that only the razor blade cutting edge is allowed to penetrate into the magnetic field.
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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) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |