US3774194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Game court boundary indicator system
Assignee: Individual
•
Filing: 1972-01-12
•
Granted: 1973-11-20
•
Expires: 1992-01-12
Abstract
Abstract A game court boundary indicator system in which critical zones adjoining the boundary lines have protected and/or concealed sensing means responsive to the proximity of a playing ball having triggering means, said sensing means being unaffected by the presence of the player''s body or the tennis racket, and connected to circuit means actuating indicating means.
Inventors
- 👤 P Jokay
- 👤 S Grill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:50
CPC Classifications
A; A63; A63B; A63B71/00; A63B71/06; A63B71/0605; A63B2071/0611; A63B2209/00; A63B2209/08; A63B43/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A playing court boundary indicator system comprising: a playing court; a boundary line on said court; a critical zone adjoining said boundary line; sensing means in said critical zone; indicating means; circuit means associating the sensing means with said indicating means; a playing ball; said ball having triggering means; said triggering means in said ball when in said critical zone affecting said sensing means; whereby said indicating means is actuated, providing a definite indication index of the position of said ball with respect to said critical zone.
Claim 2
Dependent Claim
87 words
A playing court boundary indicator system comprising: a playing court; a boundary line on said court; a critical zone adjoining said boundary line; sensing means in said critical zone; indicating means; circuit means associating the sensing means with said indicating means; a playing ball; said ball having triggering means; said triggering means in said ball when in said critical zone affecting said sensing means; whereby said indicating means is actuated, providing a definite indication index of the position of said ball with respect to said critical zone.
Claim 3
Dependent Claim
25 words
A system as claimed in claim 1 in which the triggering means in the ball has a plurality of conductive windings coiled about different axes.
Claim 4
Dependent Claim
33 words
A system as claimed in claim 1 having a transmitter of a predetermined frequency, in Which the triggering means in the ball is a tuned circuit corresponding to the frequency of the transmitter.
Claim 5
Dependent Claim
26 words
A system as claimed in claim 1 in which the sensing means has an antenna below the surface of the playing court in said critical zone.
Claim 6
Dependent Claim
74 words
A system as claimed in claim 1 in which the playing court includes a ''''single'''' critical zone, and a ''''double'''' critical zone, each having separate sensing means, and a switch in said circuit means to selectively connect the sensing means of both the ''''single'''' and ''''double'''' critical zones to the indicating means in one position of said switch and the sensing means of only the ''''double'''' critical zone in another position of said switch.
Claim 7
Dependent Claim
19 words
A system as claimed in claim 1 in which the triggering means in the ball includes a magnetic material.
Claim 8
Dependent Claim
18 words
A system as claimed in claim 1 in which radio frequency energy is fed into said sensing means.
Claim 9
Dependent Claim
37 words
A system as claimed in claim 1 in which the sensing means is connected to one portion of a balanced bridge circuit, and the indicating means is connected to the remaining position of the said bridge circuit.
Claim 10
Dependent Claim
28 words
A system as claimed in claim 1 in which the sensing means radiates two different radio frequencies, and the triggering means in the ball is a mixer circuit.
References Cited (Backward Citations)
US3645528A
Cited
US3415517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |