Patent US3707450A successfully refreshed from Google Patents.
US3707450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating for cathodically protected structures
Assignee: Bethlehem Steel Corp
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Filing: 1970-08-05
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Granted: 1972-12-26
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Expires: 1990-08-05
Abstract
Abstract A CATHODICALLY PROTECTED METAL ARTICLE, SUCH AS A PIPELINE, TANK, OR VESSEL, IS COVERED WITH A FIRST COATING OF CHLORINATED RUBBER, AND A SECOND, OUTER COATING OF A BITUMINOUS MATERIAL WHEREIN EITHER OR BOTH COATINGS CONTAIN A DISPERSION OF NOT LESS THAN 5% BY WEIGHT OF CALCIUM CARBONATE. THE THUS COATED ARTICLE EXHIBITS IMPROVED CORROSION RESISTANCE.
Inventors
- 👤 Herbert E Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:13
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; C; C23; C23F; C23F13/00; C23F13/02; E; E04; E04B; E04B1/00; E04B1/62; E04B1/64; E04B1/642; Y; Y10; Y10S; Y10S138/00; Y10S138/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |