Patent US3980328A successfully refreshed from Google Patents.
US3980328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorbar system
Assignee: Individual
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Filing: 1975-05-21
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Granted: 1976-09-14
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Expires: 1995-05-21
Abstract
Abstract Improvement in a doorbar device for barring the door of a doorway, the doorway having doorjambs and a door therefor, the door having a doorknob, the doorbar device comprising a doorknob constructed to be affixed to the doorjambs of the doorway to extend across and bar the door from being opened, the doorbar device also comprising a mechanism for applying a force upon the doorknob to prevent turning thereof.
Inventors
- 👤 Ernest A. Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:39
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/003; Y; Y10; Y10S; Y10S292/00; Y10S292/24; Y10S292/53; Y10S292/54; Y10T; Y10T292/00; Y10T292/20; Y10T292/23; Y10T292/237; Y10T70/00; Y10T70/40; Y10T70/411
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
Improvement in a doorbar device for barring the door of a doorway, said doorway having doorjambs and a door therefor, said door having a doorknob, said doorbar device comprising a doorbar constructed to be affixed to the doorjambs of said doorway to extend across and bar the door from being opened, said doorbar device also comprising a mechanism for applying a force upon said doorknob to prevent turning thereof, said mechanism being carried on said doorbar for applying a squeezing force upon opposite faces of said doorknob.
Claim 2
Dependent Claim
87 words
Improvement in a doorbar device for barring the door of a doorway, said doorway having doorjambs and a door therefor, said door having a doorknob, said doorbar device comprising a doorbar constructed to be affixed to the doorjambs of said doorway to extend across and bar the door from being opened, said doorbar device also comprising a mechanism for applying a force upon said doorknob to prevent turning thereof, said mechanism being carried on said doorbar for applying a squeezing force upon opposite faces of said doorknob.
Claim 3
Dependent Claim
33 words
Improvement as claimed in claim 1, said mechanism including a plate and fasteners operative upon said plate for pulling the same toward said doorbar to squeeze said doorknob between said plate and doorbar.
Claim 4
Dependent Claim
41 words
Improvement as claimed in claim 2, said plate having an open-ended slot therein to receive and accommodate the shank of said doorknob during use of said doorbar device, said fasteners being carried on said doorbar and threadably engaged with said plate.
Claim 5
Dependent Claim
96 words
Improvement in a method of barring the door of a doorway, said doorway having doorjambs and a door therefor, said door having a doorknob, said improvement comprising using the doorjambs of said doorway to fasten a doorbar across said door to bar the same from being opened and using said doorbar to apply a force on said doorknob to prevent the same from turning, said force applied to said doorknob being a squeezing force which squeezes upon opposite faces of said doorknob to prevent turning thereof, one face of said doorknob being squeezed against said doorbar.
Claim 6
Dependent Claim
96 words
Improvement in a method of barring the door of a doorway, said doorway having doorjambs and a door therefor, said door having a doorknob, said improvement comprising using the doorjambs of said doorway to fasten a doorbar across said door to bar the same from being opened and using said doorbar to apply a force on said doorknob to prevent the same from turning, said force applied to said doorknob being a squeezing force which squeezes upon opposite faces of said doorknob to prevent turning thereof, one face of said doorknob being squeezed against said doorbar.
Claim 7
Dependent Claim
32 words
Improvement as claimed in claim 4, holding a plate against a face of said doorknob, and pulling said plate toward said doorbar to squeeze said doorknob between said plate and said doorbar.
Claim 8
Dependent Claim
36 words
Improvement as claimed in claim 5, using fasteners to so pull said plate, said plate having an open-ended slot therein, receiving and accommodating the shank of said doorknob in said slot during use of said plate.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |