Patent US3042578A successfully refreshed from Google Patents.
US3042578A
Expired / Lapsed
US
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Insulating product and its manufacture
Assignee: Johns Manville Perlite Corp
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Filing: 1955-09-19
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Granted: 1962-07-03
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Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Paul S Denning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:12
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; B; B28; B28B; B28B1/00; B28B1/52; D; D21; D21F; D21F11/00; D21F11/02; D21F11/04; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/16; F; F16; F16L; F16L59/00; F16L59/02; F16L59/029; Y; Y10; Y10S; Y10S106/00; Y10S106/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
A MOLDED LIGHT WEIGHT INSULATING MATERIAL CONSISTING ESSENTIALLY OF PARTICLES OF EXPANDED PERLITE SOME OF WHICH ARE AS FINE AS 100 MESH IN SIZE, THE PERLITE PARTICLES BEING IN SUBSTANTIAL CONTACT, SAID CONTACT BEING CHARACTERIZED BY POINT CONTACT AS DISTINGUISHED FROM SURFACE CONTACT, THEREBY LEAVING A MULTITUDE OF CONNECTING INTERSTICES BETWEEN THE PARTICLES, AND A MINOR AMOUNT OF SHORT FIBER LYING IN SAID INTERSTICES AND CONSTITUTING A FIBER NETWORK TO HOLD SAID PERLITE IN THE MOLDED SHAPE, AND A BINDING CONSTITUENT CONSISTING ESSENTIALLY OF ORGANIC MATERIAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |