US3484561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apartment telephone-intercom and door release system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1966-07-11
•
Granted: 1969-12-16
•
Expires: 1986-07-11
Abstract
No abstract record available.
Inventors
- 👤 John T Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:42
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/02; H04M11/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2496159A
Cited
US2557161A
Cited
US3156781A
Cited
US3112373A
Cited
US3284571A
Cited
US3342934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |