US3447135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peripheral data exchange
Assignee: International Business Machines Corp
•
Filing: 1966-08-18
•
Granted: 1969-05-27
•
Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Salvatore A Calta
- 👤 Harry A Carlson
- 👤 Gerry D Granito
- 👤 Lynn W Kaumeyer
- 👤 Alphonse U Marcotte
- 👤 Benedicto U Messina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:11
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/10; G06F13/12; G06F13/122; G06F13/14; G06F13/16; G06F13/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3225334A
Cited
US3239819A
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US3292151A
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US3307150A
Cited
US3249924A
Cited
US3297996A
Cited
US3300763A
Cited
US3303476A
Cited
US3337855A
Cited
US3368207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |