US2872997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for electro-acoustic apparatus
Assignee: US Philips Corp
•
Filing: 1953-09-15
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Granted: 1959-02-10
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Expires: 1973-09-15
Abstract
No abstract record available.
Inventors
- 👤 Scheerbarth Maximilian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:25
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US440147A
Cited
GB189714448A
Cited
US1412841A
Cited
US1954392A
Cited
US2078321A
Cited
US2080275A
Cited
US2219524A
Cited
US2372672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |