US2796946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound absorbing and correcting material and method of making same
Assignee: Industrial Research Laboratories Inc
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Filing: 1954-07-15
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Granted: 1957-06-25
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Expires: 1974-07-15
Abstract
No abstract record available.
Inventors
- 👤 Kulmann William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:26
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00034; C04B2111/00094; C04B2111/20; C04B2111/28; C04B2111/52; E04B2001/8457; E04B2001/8476; E04B2001/848; E04B2001/849
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |