US4133935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated electrodes for underwater metal working
Assignee: United States Department of the Navy
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Filing: 1977-11-17
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Granted: 1979-01-09
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Expires: 1997-11-17
Abstract
Abstract A waterproof electrode useful in metal-working is obtained by coating the electrode with a polyolefin selected from the class consisting of polyethylene, polypropylene, polybutylene and mixtures thereof at a thickness from 0.25 cm to 0.80 cm by a method which comprises placing the electrode inside a polyolefinic heat-shrinkable tubing of a length sufficient to cover at least 0.6 cm of the bare metal of an electrode with a flux coating and sufficient to extend at least 0.8 cm beyond the electrode and with a diameter and a shrinkability sufficient to bring the polyolefin in contact with the bare metal of a flux-coated electrode.
Inventors
- 👤 Thomas J. Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0255; B23K35/0261; B23K35/0272; B23K35/40; B23K35/404; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2951; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
A waterproofed electrode suitable for wet metal-working which comprises an electrode and a coating comprising from 0.25 to 0.80 cm of a thermally degradable material having a dielectric strength of at least 300 volt/mil, and a water absorption power of not greater than 0.10 weight percent/48 hours; said coating is produced by the method comprising encasing said electrode in a heat-shrinkable tubing of a polyolefin selected from the class consisting of polyethylene, polypropylene, polybutylene, and mixtures thereof and heating said electrode at a temperature not exceeding 90% of the melting point in degrees centigrade of said tubing until said tubing has tightly sealed said electrode.
Claim 2
Dependent Claim
105 words
A waterproofed electrode suitable for wet metal-working which comprises an electrode and a coating comprising from 0.25 to 0.80 cm of a thermally degradable material having a dielectric strength of at least 300 volt/mil, and a water absorption power of not greater than 0.10 weight percent/48 hours; said coating is produced by the method comprising encasing said electrode in a heat-shrinkable tubing of a polyolefin selected from the class consisting of polyethylene, polypropylene, polybutylene, and mixtures thereof and heating said electrode at a temperature not exceeding 90% of the melting point in degrees centigrade of said tubing until said tubing has tightly sealed said electrode.
Claim 3
Dependent Claim
10 words
The electrode of claim 1 wherein said polyolefin is polyethylene.
Claim 4
Dependent Claim
10 words
The electrode of claim 1 wherein said polyolefin is polypropylene.
Claim 5
Dependent Claim
33 words
The electrode of claim 1 wherein said coating covers at least 0.6 cm of the bare metal if the electrode is partially flux coated and completely covers the welding end of said electrode.
Claim 6
Independent Claim
92 words
A method of coating an electrode suitable for wet metal-working which comprises placing said electrode in a heat shrinkable tubing of a material selected from the class consisting of polyethylene, polypropylene, polybutylene, and mixtures thereof, said tubing having a length sufficient to seal said electrode and to extend at 0.8 cm beyond the end of said electrode which contacts a work-piece and a thickness from 0.25 to 0.8 cm; shrinking said tubing until said electrode is sealed; and crimping said tubing thereby sealing the end of said electrode which contacts a work-piece.
Claim 7
Independent Claim
92 words
A method of coating an electrode suitable for wet metal-working which comprises placing said electrode in a heat shrinkable tubing of a material selected from the class consisting of polyethylene, polypropylene, polybutylene, and mixtures thereof, said tubing having a length sufficient to seal said electrode and to extend at 0.8 cm beyond the end of said electrode which contacts a work-piece and a thickness from 0.25 to 0.8 cm; shrinking said tubing until said electrode is sealed; and crimping said tubing thereby sealing the end of said electrode which contacts a work-piece.
Claim 8
Dependent Claim
33 words
The method of claim 5, wherein said heat-shrinkable tubing has a diameter from 0.003 cm to 0.010 cm greater than the diameter of said electrode and is capable of shrinking at least 10%.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein said tubing is capable of shrinking at least 20%.
Claim 10
Dependent Claim
16 words
The method of claim 6, wherein said tubing is capable of shrinking from 25 to 35%.
References Cited (Backward Citations)
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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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |