US3421260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced hangar door
Assignee: HAROLD W DICKINSON
•
Filing: 1967-09-27
•
Granted: 1969-01-14
•
Expires: 1987-09-27
Abstract
No abstract record available.
Inventors
- 👤 Harold W Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:49
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1378123A
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US1749425A
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DE677070C
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US2148735A
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US2610366A
Cited
US2718036A
Cited
US2790210A
Cited
US2872183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |