US3431970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing structures containing shaped voids
Assignee: Dow Chemical Co
•
Filing: 1965-03-22
•
Granted: 1969-03-11
•
Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Franciszek Olstowski
- 👤 John G Mezoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:05
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/536; A; A63; A63D; A63D9/00; B; B22; B22C; B22C9/00; B22C9/10; B22D; B22D17/00; B22D19/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1137373A
Cited
US1191383A
Cited
US3104196A
Cited
US3239319A
Cited
US3247294A
Cited
US3353258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |