Patent US3701672A successfully refreshed from Google Patents.
US3701672A
Expired / Lapsed
US
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Bituminous fibrous building product and method of preparing same
Assignee: International Permalite Inc
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Filing: 1970-03-27
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Granted: 1972-10-31
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Expires: 1990-03-27
Abstract
Abstract A BUILDING PRODUCT IS DISCLOSED COMPRISING EXPANDED PERLITE AND A SPECIFICALLY PREPARED CORRUGATED BOXBOARD BASED FIBER. THE BUILDING PRODUCT EXHIBITS SUPERIOR PROPERTIES IN THE STRENGTH AND ABRASION RESISTANCE CATEGORIES AMONG OTHERS.
Inventors
- 👤 David L Ruff
- 👤 Nadeem U Siddiqui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:31
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/16; C; C04; C04B; C04B26/00; C04B26/02; C04B26/26; D; D21; D21H; D21H11/00; D21H11/14; D21H13/00; D21H13/36; D21H17/00; D21H17/61; D21H5/00; D21H5/12; D21H5/18; D21J; D21J1/00; D21J1/16; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |