US3472305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soundproof and heatproof slat for venetian blinds
Assignee: MARY S LEFES
•
Filing: 1968-04-30
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Granted: 1969-10-14
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Expires: 1988-04-30
Abstract
No abstract record available.
Inventors
- 👤 Mary S Lefes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/38; E06B9/386
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2325003A
Cited
US2590204A
Cited
US2959495A
Cited
US2820512A
Cited
US3217832A
Cited
US3386527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |