US3623938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral aggregate insulation board
Assignee: Johns Manville Corp
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Filing: 1970-05-07
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Granted: 1971-11-30
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Expires: 1990-05-07
Abstract
Abstract A strong, mineral aggregate insulation board of lowered thermal conductivity is provided by incorporating 40-80 percent by weight of ultrafine particles of expanded volcanic glass that is 60 mesh and finer particle size, and 5-30 percent by weight of mineral fiber. Short absorbent vegetable fibers are included in the board for strength. Sizing agents are also often added to impart water resistance to the board, and additional adhesive tack materials, or binders, are sometimes added to further increase board strength.
Inventors
- 👤 Kenneth Lee Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/04; C; C04; C04B; C04B26/00; C04B26/02; C04B26/28; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/16; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
The insulation board of claim 1 in which at least about 50 percent by weight of said volcanic glass particles pass a 200 mesh U.S. Standard screen before their expansion.
Claim 2
Dependent Claim
21 words
The insulation board of claim 1 in which the mineral fiber is selected from rock wool, glass wool, and asbestos fibers.
Claim 3
Dependent Claim
24 words
The insulation board of claim 3 in which the mineral fiber is present in amounts of from 10 to about 30 percent by weight.
Claim 4
Dependent Claim
26 words
The insulation board of claim 1 wherein the aggregate of binder and sizing agent comprises 5-25 percent by weight of starch binder and asphalt sizing agent.
Claim 5
Dependent Claim
74 words
A mineral aggregate insulation board comprising: a. 50-70 percent by weight of an expanded volcanic glass, said expanded glass consisting essentially of 60 mesh, U.S. Standard screen size, and finer particles; b. 10-30 percent by weight of mineral fibers; c. 10-25 percent by weight of short, absorbent vegetable fiber; d. 5-10 percent by weight in the aggregate of a binder for imparting strength to the board and a sizing agent for imparting water resistance.
Claim 6
Dependent Claim
14 words
The insulation board of claim 6 in which the expanded volcanic glass is perlite.
Claim 7
Dependent Claim
43 words
The insulation board of claim 7 in which about 75 percent of the perlite particles prior to expansion are finer than a 100 mesh screen and about 50 percent of the perlite particles prior to expansion are finer than a 200 mesh screen.
Claim 8
Dependent Claim
21 words
The insulation board of claim 7 in which the mineral fiber is selected from rock wool, glass wool, and asbestos wool.
Claim 9
Dependent Claim
18 words
The insulation board of claim 7 in which the mineral fibers are from one-eighth to one inch long.
Claim 10
Dependent Claim
72 words
The insulation board of claim 7 in which the perlite particles before expansion consist of, by weight percent, 0-3 percent of particles that are held on a 100 mesh screen; 12-22 percent of particles that are held on a 200 mesh screen; 25-45 percent of particles that are held on a 325 mesh screen; and 30-60 percent that pass a 325 mesh screen, all screen sizes referring to U.S. Standard screen size.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |