US3449094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated electrets
Assignee: Philip Morris USA Inc
•
Filing: 1965-10-23
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Granted: 1969-06-10
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Baxt
- 👤 John R Mcdowell
- 👤 Lawrence L Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:38
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; G; G03; G03G; G03G5/00; G03G5/16; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; H01B; H01B1/00; H01B3/00; H01B3/002; H01B3/004; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/26; H01F10/265; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S55/00; Y10S55/39; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12063; Y10T428/12069; Y10T428/12104; Y10T428/12111; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12986; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/3154; Y10T428/31551; Y10T428/31565; Y10T428/31605; Y10T428/31609; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31703; Y10T428/31714; Y10T428/31801
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2740184A
Cited
US2916038A
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US3005707A
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US3138517A
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US3268331A
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US3316620A
Cited
US3354373A
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US3359145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |