US3497995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Height sensitive proximity door operator system
Assignee: Stanley Works
•
Filing: 1968-04-19
•
Granted: 1970-03-03
•
Expires: 1988-04-19
Abstract
No abstract record available.
Inventors
- 👤 Roy W Forsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:24
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/70; E05F15/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2031226A
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US2149177A
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US2695977A
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US2895728A
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US3041507A
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US3199096A
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US3293631A
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US3181856A
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US3201774A
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US3199033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |