US2721731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined radiant heat and acoustic tile unit structure
Assignee: Houdaille Hershey Corp
•
Filing: 1951-01-05
•
Granted: 1955-10-25
•
Expires: 1971-01-05
Abstract
No abstract record available.
Inventors
- 👤 George M Rapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/12; F24D3/16; F24D3/165; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1086898A
Cited
GB274664A
Cited
US1749159A
Cited
US1744517A
Cited
US1932971A
Cited
US2271871A
Cited
US2382340A
Cited
US2486563A
Cited
US2662743A
Cited
US2646971A
Cited
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 |