US3440314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making custom-fitted earplugs for hearing aids
Assignee: Dow Silicones Corp
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Filing: 1966-09-30
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Granted: 1969-04-22
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Expires: 1986-09-30
Abstract
No abstract record available.
Inventors
- 👤 Eldon E Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/65; H04R25/652; H04R25/656; H04R25/60; H04R25/658; H04R25/659
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |