US3100245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keysender frequency selector
Assignee: Individual
•
Filing: 1960-11-03
•
Granted: 1963-08-06
•
Expires: 1980-11-03
Abstract
No abstract record available.
Inventors
- 👤 Nathan W Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A KEYSENDING, FREQUENCY SELECTING SYSTEM COMPRISING; A PLURALITY OF KEYS, A PLURALITY OF SWITCHING ARMS ACTUATED BY SAID KEYS, EACH OF SAID SWITCHING ARMS MAKING CONTACT WITH A FIRST ELECTRICAL CONTACT IN A FIRST POSITION, EACH OF SAID SWITCHING ARMS MAKING CONTACT WITH A SECOND ELECTRICAL CONTACT IN A SECOND POSITION, A SOURCE OF VOLTAGE OF ONE POLARITY WITH RESPECT TO GROUND CONNECTED TO EACH OF SAID FIRST ELECTRICAL CONTACTS, A SOURCE OF VOLTAGE OF THE OTHER POLARITY WITH RESPECT TO GROUND CONNECTED TO EACH OF SAID SECOND ELECTRICAL CONTACTS, A PLURALITY OF SOURCES OF OSCILLATING ELECTRICAL ENERGY OF DIFFERENT FREQUENCIES, MEANS FOR COUPLING SAID SOURCES OF OSCILLATING ELECTRICAL ENERGY TO A COMMON LINE, A PLURALITY OF DIODES, EACH CONNECTING ONE OF SAID SWITCHING ARMS TO ONE OF SAID SOURCES OF OSCILLATING ELECTRICAL ENERGY WHICH IS ACTUATED WHEN SAID SWITCHING ARM IS IN SAID SECOND POSITION.
Claim 2
Dependent Claim
146 words
A KEYSENDING, FREQUENCY SELECTING SYSTEM COMPRISING; A PLURALITY OF KEYS, A PLURALITY OF SWITCHING ARMS ACTUATED BY SAID KEYS, EACH OF SAID SWITCHING ARMS MAKING CONTACT WITH A FIRST ELECTRICAL CONTACT IN A FIRST POSITION, EACH OF SAID SWITCHING ARMS MAKING CONTACT WITH A SECOND ELECTRICAL CONTACT IN A SECOND POSITION, A SOURCE OF VOLTAGE OF ONE POLARITY WITH RESPECT TO GROUND CONNECTED TO EACH OF SAID FIRST ELECTRICAL CONTACTS, A SOURCE OF VOLTAGE OF THE OTHER POLARITY WITH RESPECT TO GROUND CONNECTED TO EACH OF SAID SECOND ELECTRICAL CONTACTS, A PLURALITY OF SOURCES OF OSCILLATING ELECTRICAL ENERGY OF DIFFERENT FREQUENCIES, MEANS FOR COUPLING SAID SOURCES OF OSCILLATING ELECTRICAL ENERGY TO A COMMON LINE, A PLURALITY OF DIODES, EACH CONNECTING ONE OF SAID SWITCHING ARMS TO ONE OF SAID SOURCES OF OSCILLATING ELECTRICAL ENERGY WHICH IS ACTUATED WHEN SAID SWITCHING ARM IS IN SAID SECOND POSITION.
References Cited (Backward Citations)
US2542592A
Cited
US2966659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |