US2671522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound-absorbing panel
Assignee: Individual
•
Filing: 1950-03-31
•
Granted: 1954-03-09
•
Expires: 1970-03-31
Abstract
No abstract record available.
Inventors
- 👤 Bourgeois Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:56
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2242834A
Cited
US1628090A
Cited
US1660745A
Cited
US1875074A
Cited
US1910810A
Cited
US1961374A
Cited
GB453065A
Cited
US2413568A
Cited
FR889245A
Cited
US2459121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |