US2721471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall construction
Assignee: United States Gypsum Co
•
Filing: 1951-07-26
•
Granted: 1955-10-25
•
Expires: 1971-07-26
Abstract
No abstract record available.
Inventors
- 👤 Nelsson Nels
- 👤 George W Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:29
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/84; E04B2/842; E04B2/72; E04B2/723; E04B2/74; E04B2002/7488
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |