Patent US3543453A successfully refreshed from Google Patents.
US3543453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sanitary sewer manholes
Assignee: GENE P WRIGHT
•
Filing: 1969-04-04
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Granted: 1970-12-01
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Expires: 1989-04-04
Abstract
No abstract record available.
Inventors
- 👤 Gene P Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:21
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/02; E03F5/027; E02; E02D; E02D29/00; E02D29/12; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6991
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) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |