US2821294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank linings
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1957-01-22
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Granted: 1958-01-28
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Edward C Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:29
CPC Classifications
B; B29; B29D; B29D22/00; B29D22/003; B65; B65D; B65D85/00; B65D85/70; B65D85/84; Y; Y10; Y10S; Y10S220/00; Y10S220/917
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
THE PROCESS OF PREPARING A CONTAINER SUITABLE FOR THE HANDLING OF CORROSIVE CHEMICALS COMPRISING (1) CALENDERING A SHEET OF NATURAL GUM RUBBER CONTAINING ABOUT 2% BY WEIGHT OF SULFUR TO A THICKNESS OF ABOUT .025 TO 1.0 INCH, (2) CALENDERING A LAYER OF NEOPRENE ONTO SAID NATURAL GUM RUBBER TO A THICKNESS OF ABOUT .005 TO .125 INCH, (3) ADHERING SAID CALENDERED STOCK TO THE INSIDE OF A METAL TANK BY MEANS OF A CEMENT AND (4) CURING THE LINING BY MEANS OF STREAM AT A TEMPERATURE OF ABOUT 275* F. AND A PRESSURE OF ABOUT 30 P.S.I. FOR A PERIOD OF ABOUT FOUR HOURS.
References Cited (Backward Citations)
US1931309A
Cited
US2311308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |