Patent US3472668A successfully refreshed from Google Patents.
US3472668A
Expired / Lapsed
US
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Reinforcement of lower density inorganic structures
Assignee: Owens Corning
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Filing: 1968-05-31
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Granted: 1969-10-14
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Expires: 1988-05-31
Abstract
No abstract record available.
Inventors
- 👤 Oliver W Pfeifer
- 👤 Richard F Shannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:11
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C03; C03C; C03C25/00; C03C25/10; C03C25/1025; C03C25/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3039981A
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US3062669A
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US2930771A
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US3062682A
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US2910383A
Cited
US3021291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |