US3472668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcement of lower density inorganic structures
Assignee: Owens Corning
•
Filing: 1968-05-31
•
Granted: 1969-10-14
•
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 08:54
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C03; C03C; C03C25/00; C03C25/10; C03C25/1025; C03C25/103
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE23228E
Cited
US2326516A
Cited
US2547127A
Cited
US2716070A
Cited
US2738285A
Cited
US3039981A
Cited
US3007813A
Cited
US3062669A
Cited
US2930771A
Cited
US3062682A
Cited
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 |