US3523309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toilet exhaust system
Assignee: WALTER B MUNDEN
•
Filing: 1967-10-31
•
Granted: 1970-08-11
•
Expires: 1987-10-31
Abstract
No abstract record available.
Inventors
- 👤 Walter B Munden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
E; E03; E03D; E03D9/00; E03D9/04; E03D9/05; E03D9/052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2112772A
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US2405812A
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US2527110A
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US2507966A
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US2603794A
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US2727249A
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US3120665A
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US3192539A
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US3277499A
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US3273170A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |