US2587684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional microphone
Assignee: Shure Inc
•
Filing: 1948-10-13
•
Granted: 1952-03-04
•
Expires: 1968-10-13
Abstract
No abstract record available.
Inventors
- 👤 Benjamin B Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:34
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/222
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE20680E
Cited
US2237298A
Cited
US2293258A
Cited
US2327136A
Cited
US2305597A
Cited
US2346395A
Cited
US2399513A
Cited
US2401328A
Cited
GB594646A
Cited
US2485405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |