Patent US4218875A successfully refreshed from Google Patents.
US4218875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm
Assignee: Individual
•
Filing: 1977-08-26
•
Granted: 1980-08-26
•
Expires: 1997-08-26
Abstract
Abstract An alarm clock having a removable throwable alarm.
Inventors
- 👤 Michael L. Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:55
CPC Classifications
G; G04; G04C; G04C21/00; G04C21/02; G04B; G04B23/00; G04B23/02; G04B23/03; G04B37/00; G04B37/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
In an improved alarm clock having an electric clock portion and a removable electric alarm portion, wherein said alarm portion has a signal which emits an audible sound when activated by said clock portion at a preselected time, the improvement comprising, said alarm portion having an energy storage means for enabling said signal to continue to emit the audible sound after said alarm portion is removed from said clock portion, said alarm portion being throwable and having an impact switch means adapted to deenergize said storage means upon impact of said thrown alarm portion against an object thereby temporarily closing said switch for deactivating said signal, and said alarm portion having an impact-absorbing casing to protectively house said signal upon impact, whereby said alarm portion is reusable after impact.
Claim 2
Dependent Claim
129 words
In an improved alarm clock having an electric clock portion and a removable electric alarm portion, wherein said alarm portion has a signal which emits an audible sound when activated by said clock portion at a preselected time, the improvement comprising, said alarm portion having an energy storage means for enabling said signal to continue to emit the audible sound after said alarm portion is removed from said clock portion, said alarm portion being throwable and having an impact switch means adapted to deenergize said storage means upon impact of said thrown alarm portion against an object thereby temporarily closing said switch for deactivating said signal, and said alarm portion having an impact-absorbing casing to protectively house said signal upon impact, whereby said alarm portion is reusable after impact.
Claim 3
Dependent Claim
36 words
The alarm clock of claim 1 wherein said energy storage means comprises an electrical energy storage device, said energy storage device energizing said alarm portion after said alarm portion has been removed from said clock portion.
Claim 4
Dependent Claim
23 words
The alarm clock of claim 1 wherein said clock portion energizes said alarm portion until said alarm portion is removed from said clock.
Claim 5
Dependent Claim
35 words
The alarm clock of claim 1 wherein said alarm portion further comprises a multivibrator circuit, said circuit causing a transistor to become alternatingly conductive, said transistor, when conductive, completing a current path through said signal.
Claim 6
Dependent Claim
19 words
The alarm clock of claim 4 wherein said signal emits a pulsating tone when said transistor is alternatingly conductive.
Claim 7
Dependent Claim
42 words
The alarm clock of claim 5 wherein an alternate current path is completed and maintained through said signal after said impact switch means has been temporarily closed, said signal emitting a decaying, continuous tone while current flows through the alternate current path.
References Cited (Backward Citations)
US327919A
Cited
US1361413A
Cited
US1529852A
Cited
US2771559A
Cited
US3192699A
Cited
US3361974A
Cited
US3638418A
Cited
US3788059A
Cited
US3798889A
Cited
US3971207A
Cited
US4028882A
Cited
US4144706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |