US3838345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asynchronous shift cell
Assignee: Unisys Corp
•
Filing: 1973-05-25
•
Granted: 1974-09-24
•
Expires: 1993-05-25
Abstract
Abstract There is disclosed herein a new internal cell construction wherein a plurality of such cells may be connected in series for use in an asynchronous binary shift register.
Inventors
- 👤 D Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:56
CPC Classifications
G; G06; G06F; G06F5/00; G06F5/06; G06F5/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
An asynchronous shifting storage cell construction having a designated cell cycle time and for receiving data which may be longer than said cycle time comprising: a. at least first and second flip-flop means for respectively storing a one and zero data bit signal; b. means connected to the output of said flip-flops for determining whether said respective flip-flops are respectively storing a one or alternatively, a zero data bit; c. a third flip-flop coupled to said first and second flip-flop means; d. gating means connected to the output of each said first and second flip-flop for transferring said stored data bits to an output line upon initiation by said third flip-flop; e. whereby the respective one and zero data bit signals are simultaneously applied to said flip-flop means and said gating means to prevent said data from being duplicated at said output when the data bits are longer than the cell cycle time.
Claim 2
Dependent Claim
153 words
An asynchronous shifting storage cell construction having a designated cell cycle time and for receiving data which may be longer than said cycle time comprising: a. at least first and second flip-flop means for respectively storing a one and zero data bit signal; b. means connected to the output of said flip-flops for determining whether said respective flip-flops are respectively storing a one or alternatively, a zero data bit; c. a third flip-flop coupled to said first and second flip-flop means; d. gating means connected to the output of each said first and second flip-flop for transferring said stored data bits to an output line upon initiation by said third flip-flop; e. whereby the respective one and zero data bit signals are simultaneously applied to said flip-flop means and said gating means to prevent said data from being duplicated at said output when the data bits are longer than the cell cycle time.
Claim 3
Dependent Claim
39 words
An asynchronous shifting cell in accordance with claim 1 wherein a fourth flip-flop is provided, said fourth flip-flop being an edge triggering flip-flop which clears said first and second flip-flops after information has been transferred by said gating means.
Claim 4
Dependent Claim
27 words
An asynchronous shifting storage cell in accordance with claim 1 wherein said means for determining whether said respective flip-flops are storing data comprises a NOR gating means.
Claim 5
Dependent Claim
25 words
An asynchronous shifting storage cell in accordance with claim 1 wherein said means for transferring stored bits to an output line comprises NAND gating means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |