US3491676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular air door construction
Assignee: HASTINGS INDUSTRIES Inc
•
Filing: 1968-12-02
•
Granted: 1970-01-27
•
Expires: 1988-12-02
Abstract
No abstract record available.
Inventors
- 👤 Artel R Henson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:22
CPC Classifications
F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3308740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |