US2841255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical system
Assignee: Individual
•
Filing: 1955-03-03
•
Granted: 1958-07-01
•
Expires: 1975-03-03
Abstract
No abstract record available.
Inventors
- 👤 Kemp William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/04; E04B9/0478; E04B9/0485; E04B9/001; E04B9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB347860A
Cited
US1960078A
Cited
US1931695A
Cited
US2157251A
Cited
US2213234A
Cited
US2229064A
Cited
US2349158A
Cited
US2447694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |