US3728209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uninflammable structural materials
Assignee: Toshiba Corp
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Filing: 1971-07-14
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Granted: 1973-04-17
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Expires: 1991-07-14
Abstract
Abstract UNINFLAMMABLE STRUCTURAL MATERIALS CONSISTING OF A BOARD MEMBER PREPARED FROM ALUMINUM NITRIDE, PHOSPHORIC ACID AND LIGHT INORGANIC MATERIAL AND A FOAMED MEMBER MADE OF ALUMINUM NITRIDE, PHOSPHORIC ACID AND INORGANIC FOAMING MATERIAL AND INTEGRALLY BONDED WITH SAID BOARD MEMBER.
Inventors
- 👤 S Sugaike
- 👤 M Watanabe
- 👤 S Tanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:56
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/046; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; B32B15/20; B32B2266/00; B32B2266/04; B32B2266/045; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/30; B32B2307/304; B32B2307/306; B32B2307/3065; B32B2607/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249986
Claims Analysis
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |