US3733466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforating device
Assignee: Individual
•
Filing: 1971-08-02
•
Granted: 1973-05-15
•
Expires: 1991-08-02
Abstract
Abstract A multiple perforator for grading examination papers or score sheets of a type including a multitude of punches all or some of which are actuated upon manipulation of a hand actuated lever system to perforate such papers or sheets.
Inventors
- 👤 R Krumrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/02; G06K1/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
Perforating apparatus for grading examination papers comprising a base plate, a punch guide plate integral with said base plate and spaced thereabove to provide a slot to receive a sheet to be graded, a vertically reciprocal punch support plate yieldably spaced above said punch guide plate, a plurality of punches carried by the punch support plate and depending into holes in the punch guide plate, a vertically reciprocal pressure plate overlying the punch support plate, upstanding posts on said base plate on which the punch support plate and pressure plate are guided, A removable template carried by the pressure plate, and manual means operable to depress the pressure plate uniformly to urge the punches through the sheet, the manual means comprising a pair of levers, which are hingedly connected to the posts.
Claim 2
Dependent Claim
132 words
Perforating apparatus for grading examination papers comprising a base plate, a punch guide plate integral with said base plate and spaced thereabove to provide a slot to receive a sheet to be graded, a vertically reciprocal punch support plate yieldably spaced above said punch guide plate, a plurality of punches carried by the punch support plate and depending into holes in the punch guide plate, a vertically reciprocal pressure plate overlying the punch support plate, upstanding posts on said base plate on which the punch support plate and pressure plate are guided, A removable template carried by the pressure plate, and manual means operable to depress the pressure plate uniformly to urge the punches through the sheet, the manual means comprising a pair of levers, which are hingedly connected to the posts.
Claim 3
Dependent Claim
17 words
The apparatus recited in claim 1, in which means detachably connects the levers for movement in unison.
Claim 4
Dependent Claim
24 words
The apparatus recited in claim 1, in which the levers each comprise an arm having a generally horizontal portion and an upwardly inclined portion.
Claim 5
Dependent Claim
21 words
The apparatus recited in claim 1, in which the template includes means to engage and depress but some of the punches.
Claim 6
Dependent Claim
13 words
The apparatus recited in claim 1, in which the pressure plate is removable
Claim 7
Dependent Claim
14 words
The apparatus recited in claim 1, in which the punch support plate is removable.
Claim 8
Dependent Claim
27 words
The apparatus recited in claim 1, in which the yieldable means comprises a plurality of springs arranged between the punch guide plate and the punch support plate.
References Cited (Backward Citations)
US1146089A
Cited
US2008396A
Cited
US2389531A
Cited
US3059570A
Cited
US3513299A
Cited
US3515339A
Cited
US3530761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |