US3033941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for altering telephone operation
Assignee: Individual
•
Filing: 1958-07-14
•
Granted: 1962-05-08
•
Expires: 1978-07-14
Abstract
No abstract record available.
Inventors
- 👤 Robert R Bell
- 👤 Carl O Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:22
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/66; H04M1/663
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2481840A
Cited
US2715161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |