US3435568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trench duct assembly with adjustable lid supporting members
Assignee: POWER LINE PRODUCTS Inc
•
Filing: 1967-03-31
•
Granted: 1969-04-01
•
Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 Harry Joseph Hoseason
- 👤 Walter R Packman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:53
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US740663A
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CH133029A
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US1782779A
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US2054568A
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GB476625A
Cited
US2601213A
Cited
US2883228A
Cited
US3074208A
Cited
US3204378A
Cited
US3262238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |