Patent US3731710A successfully refreshed from Google Patents.
US3731710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray foam insulated pipe
Assignee: Exxon Mobil Corp
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Filing: 1971-03-01
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Granted: 1973-05-08
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Expires: 1991-03-01
Abstract
Abstract A method and apparatus for applying a spray plastic foam insulation to a pipe wherein the pipe is cleaned and preheated to at least 90*F. prior to spray application of foam. The cleaning and preheating assist in the foaming process and enhance the physical bond of the initial layer of sprayed foam to the pipe. A bitumastic and kraft paper vapor-barrier subsequently is applied thereon to the exterior surface of the insulation.
Inventors
- 👤 R Bauer
- 👤 R Kilpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:12
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/04; F16L59/02; F16L59/14; F16L59/143; F16L59/16; F16L59/18; F16L59/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1988628A
Cited
US2602764A
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US2857931A
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US3007203A
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US3420277A
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US3425455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |