US4347549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-static structure for magnetic tape guides
Assignee: Ampex Corp
•
Filing: 1980-03-24
•
Granted: 1982-08-31
•
Expires: 2000-03-24
Abstract
Abstract A magnetic tape cassette is provided with shielding means for the guide posts thereof, including a clip member of electrically-conducting material, for preventing build-up of static electrical charges and resultant clinging of the tape to the guide posts, when it is desired to pull the tape from the guide posts by vacuum pressure-differential apparatus, as for threading into a tape transport.
Inventors
- 👤 Erno H. Fechner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; Y; Y10; Y10S; Y10S242/00; Y10S242/906
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
An anti-static shield for a tape guide post arranged for confronting only one flat face of said tape, comprising: a shield member attachable to said guide post and covering the tape-confronting portions thereof to define a bearing surface for said tape; and said shield member being formed of electrically conductive material and being electrically coupled only to said one tape face.
Claim 2
Dependent Claim
61 words
An anti-static shield for a tape guide post arranged for confronting only one flat face of said tape, comprising: a shield member attachable to said guide post and covering the tape-confronting portions thereof to define a bearing surface for said tape; and said shield member being formed of electrically conductive material and being electrically coupled only to said one tape face.
Claim 3
Dependent Claim
61 words
A shield as described in claim 1, wherein said post is formed in cylindrical form, and wherein: said shield member is formed as a clip for enclasping more than a 180-degree sector of the cylindrical surface of said post; and means are provided for limiting rotation of said shield on said post to prevent uncovering of said tape-confronting of said post.
Claim 4
Dependent Claim
77 words
A shield as described in claim 2 wherein: said post has a generally triangular cross-section defining a portion including one generally flat side and two rounded apex portions adjacent to said flat side; and said shield has a shape conforming to said triangular cross-section of said post so as to enclasp said portion of the post including said flat side and said two adjacent rounded apex portions to define a non-rotating bearing element for engaging said tape.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |