US3633630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conduit insulation
Assignee: Dow Chemical Co
•
Filing: 1970-03-17
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Granted: 1972-01-11
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Expires: 1990-03-17
Abstract
Abstract Pipe insulation suitable for both low-pressure steam and refrigeration is prepared with benefit from constant composition styrene-maleic anhydride copolymer containing 85 to 65 weight percent styrene and 15 to 35 weight percent maleic anhydride.
Inventors
- 👤 Alden W Hanson
- 👤 Eugene R Moore
- 👤 Louis Robert Schanhals
- 👤 Hal G Parish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; E04D; E04D13/00; E04D13/16; E04D3/00; E04D3/35; E04D3/351; E04D3/352; F; F16; F16L; F16L59/00; F16L59/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
The insulation of claim 1 wherein the resinous body comprises two generally semicylindrical portions.
Claim 2
Dependent Claim
13 words
The conduit insulation of claim 2 having a process conduit in the passageway.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |