US2432971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous composition of matter and method of manufacture
Assignee: United States Gypsum Co
•
Filing: 1945-03-31
•
Granted: 1947-12-16
•
Expires: 1965-03-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Ruthman
- 👤 Joseph R Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:13
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1211028A
Cited
US1901057A
Cited
US2023800A
Cited
US2242372A
Cited
US2357068A
Cited
US2378322A
Cited
US2389761A
Cited
US2350161A
Cited
US2371688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-15 | 1951-06-16 | 1951-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-15 | 1955-06-16 | 1955-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-15 | 1959-06-16 | 1959-12-16 | $7700.00 | Window Closed / Lapsed |