US4304822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal tubing
Assignee: ITT Inc
•
Filing: 1980-06-04
•
Granted: 1981-12-08
•
Expires: 2000-06-04
Abstract
Abstract Corrosion resistant coatings are applied to metal tubing while substantially continuously moving the metal tubing through a series of stations. The process comprises the sequential steps of flowing by gravity a zinc-rich thermosetting coating suspended in a volatile carrier onto the tubing, the viscosity of the coating composition being such that it flows around and completely covers the external surface of the tubing, removing excess coating by means of an air blower arranged circumferentially around the tubing and sequentially heating the coated tubing first to volatize off the carrier and then more rapidly to crosslink the thermosetting coating composition.
Inventors
- 👤 Russell G. Heyl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/30; B05D3/00; B05D3/02; B05D3/0209; B05D7/00; B05D7/14; B05D7/146; B05D7/50; B05D7/52; B05D7/54; B05D7/546; B05D2350/00; B05D2350/60; B05D2350/65; B05D3/0218; B05D3/0227; B05D3/0254; B05D3/0263; B05D3/0281; B05D3/04; B05D3/0406; B05D3/042; B05D3/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12701
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
Corrosion resistant metal tubing having a first terne coating comprising a lead base alloy containing from 7-20% tin and a second coating completely covering said first coating comprising a crosslinked zinc-rich thermosetting composition.
Claim 2
Dependent Claim
33 words
Corrosion resistant metal tubing having a first terne coating comprising a lead base alloy containing from 7-20% tin and a second coating completely covering said first coating comprising a crosslinked zinc-rich thermosetting composition.
Claim 3
Dependent Claim
27 words
The corrosion resistant metal tubing of claim 1 having a precoating between the first coating and the zinc-rich coating to enhance the adherence of the zinc-rich coating.
Claim 4
Dependent Claim
16 words
The corrosion resistant metal tubing of claim 2 in which the precoating is an organic chromate.
Claim 5
Dependent Claim
21 words
The corrosion resistant metal tubing of claim 1 in which the metal tubing is from 1/8" through 3/4" in outside diameter.
Claim 6
Dependent Claim
17 words
The corrosion resistant metal tubing of claim 1 in which the zinc-rich coating contains 75-90% zinc powder.
References Cited (Backward Citations)
US3687738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |