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US4021891B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic lock closure
Assignee: Application Art Laboratories Co Ltd
•
Filing: 1974-04-18
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Granted: 1987-09-08
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Expires: 1994-04-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:21
CPC Classifications
A; A45; A45C; A45C13/00; A45C13/10; A45C13/1069; E; E05; E05C; E05C19/00; E05C19/16; Y; Y10; Y10T; Y10T24/00; Y10T24/32; Y10T292/00; Y10T292/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |