US3125813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masking panel construction for
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
•
Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:34
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04; B; B42; B42F; B42F13/00; B42F13/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
"PROGRAM TEACHING" MASK APPARATUS FOR PAGES PREPARED WITH A SERIES OF SEQUENTIALLY ARRANGED QUESTIONS AND ANSWERS IN ADJACENT COLUMNAR AREAS ON SAID PAGES COMPRISING, A SUPPORT MEMBER, A MASKING MEMBER VERTICALLY SLIDABLE RELATIVE TO SAID SUPPORT, MEANS HOLDING SAID MASKING MEMBER IN A PREDETERMINED POSITIONAL RELATION TRANSVERSELY OF SAID SUPPORT MEMBER, SAID MEANS INCLUDING AN ELONGATED SLIDE,
Claim 2
Dependent Claim
57 words
"PROGRAM TEACHING" MASK APPARATUS FOR PAGES PREPARED WITH A SERIES OF SEQUENTIALLY ARRANGED QUESTIONS AND ANSWERS IN ADJACENT COLUMNAR AREAS ON SAID PAGES COMPRISING, A SUPPORT MEMBER, A MASKING MEMBER VERTICALLY SLIDABLE RELATIVE TO SAID SUPPORT, MEANS HOLDING SAID MASKING MEMBER IN A PREDETERMINED POSITIONAL RELATION TRANSVERSELY OF SAID SUPPORT MEMBER, SAID MEANS INCLUDING AN ELONGATED SLIDE,
References Cited (Backward Citations)
US1500777A
Cited
US1884814A
Cited
US2234075A
Cited
US2531142A
Cited
US3021612A
Cited
US3032892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |