Patent US3715846A successfully refreshed from Google Patents.
US3715846A
Expired / Lapsed
US
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Self-supporting insulating element
Assignee: Individual
•
Filing: 1970-09-08
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Granted: 1973-02-13
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Expires: 1990-09-08
Abstract
Abstract A self-supporting insulating element for roofs and walls with an insulating core of hard foam material, especially polyurethane hard foam material, and with two cover layers one of which is formed by a reinforced metal sheet or reinforced web of synthetic material.
Inventors
- 👤 H Sullhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:22
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/35; E04D3/351; E04D3/355; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; E04C2/26; E04C2/284; E04C2/296; E04C2/30; E04C2/34; E04C2/36; E04D3/352
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |