Patent US3644884A successfully refreshed from Google Patents.
US3644884A
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Modular timer for use in traffic control systems
Assignee: REMOTE CONTROLS CORP
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Filing: 1969-05-20
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Granted: 1972-02-22
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Expires: 1989-05-20
Abstract
Abstract A cyclic timer and a traffic controller incorporating that timer, and an intersection traffic control system. The timer includes a plurality of timing modules interconnected so that when one module completes the timing of its interval, it turns on the next timing module which, in turn, turns off the module that just completed its interval. The traffic controller further includes a switching unit which accepts inputs from the cyclic timer and in response thereto provides excitation for an intersection right-of-way indicator such as a traffic light. The intersection right-of-way control system permits drivers in preferred directions to continuously receive right-of-way as they traverse the system and provides preferred streets for every direction of travel.
Inventors
- 👤 John J Matysek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:28
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/07; G08G1/081; G08G1/085; H; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 81
Claim 1
Independent Claim
299 words
A cyclic timer comprising: a. a plurality of timing modules, each timing module including: 1. first switching means having a first input, a second input, a power input, and an output, and capable in response to a signal on its first input of assuming an activated state in which current is permitted to pass from said power input through said first switching means to provide an output signal at said first switching means output and is response to a signal on its second input of assuming a deactivated state in which current is prevented from passing from said power input through said first switching means; 2. voltage storage means coupled to said first switching means output and adapted to be charged therefrom; 3. voltage-responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means; 4. a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means; 5. means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of saiD plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and 6. means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 2
Dependent Claim
299 words
A cyclic timer comprising: a. a plurality of timing modules, each timing module including: 1. first switching means having a first input, a second input, a power input, and an output, and capable in response to a signal on its first input of assuming an activated state in which current is permitted to pass from said power input through said first switching means to provide an output signal at said first switching means output and is response to a signal on its second input of assuming a deactivated state in which current is prevented from passing from said power input through said first switching means; 2. voltage storage means coupled to said first switching means output and adapted to be charged therefrom; 3. voltage-responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means; 4. a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means; 5. means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of saiD plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and 6. means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 3
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 4
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 5
Dependent Claim
111 words
A timer as claimed in claim 1 further comprising power control means connected to the power input of the first switching means of each timing module and adapted for connection to a source of voltage, said power control means including a control input and when connected to a source of voltage adapted to assume in the absence of a signal at its control input a first state in which power is provided to the first switching means of each timing module and to assume in the presence of a signal at its control input a second state in which power is blocked from the first switching means of each timing module.
Claim 6
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 7
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 8
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 9
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 10
Dependent Claim
36 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom when said controlled rectifier means is in its second state and said solid-state control means is in its first state;
Claim 11
Dependent Claim
36 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom when said controlled rectifier means is in its second state and said solid-state control means is in its first state;
Claim 12
Dependent Claim
36 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom when said controlled rectifier means is in its second state and said solid-state control means is in its first state;
Claim 13
Dependent Claim
36 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom when said controlled rectifier means is in its second state and said solid-state control means is in its first state;
Claim 14
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 15
Dependent Claim
16 words
voltage storage means coupled to said first switching means output and adapted to be charged therefrom;
Claim 16
Dependent Claim
27 words
voltage-responsive switching means coupled to saiD voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 17
Dependent Claim
27 words
voltage-responsive switching means coupled to saiD voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 18
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 19
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 20
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 21
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 22
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 23
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 24
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 25
Dependent Claim
28 words
voltage responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 26
Dependent Claim
223 words
A timer as claimed in claim 1 in which the first switching means of each timing module includes: a. controlled rectifier means having an input terminal connected to said first switching means power input, an output terminal connected to said first switching means output, and a control terminal connected to said first switching means first input, said controlled rectifier means normally assuming a first state in which current flow from its input terminal to its output terminal is prevented, said controlled rectifier means in response to a signal applied to its control terminal assuming a second state in which current flow is permitted from its input terminal to its output terminal, said controlled rectifier means upon assumption of the second state remaining in the second state so long as current is available to its input terminal; and b. solid-state control means having a first terminal adapted for connection to an electric power source, a second terminal connected to said controlled rectifier means input terminal, and a third terminal connected to said first switching means second input, said solid-state control means in the absence of a signal on its third terminal permitting current flow from its first terminal to its second terminal and in the presence of a signal on its third terminal preventing current flow from its first terminal to its second terminal.
Claim 27
Dependent Claim
27 words
voltage-responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 28
Dependent Claim
27 words
voltage-responsive switching means coupled to said voltage storage means for discharging said voltage storage means in response to a predetermined voltage level on said voltage storage means;
Claim 29
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 30
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 31
Dependent Claim
18 words
A timer as claimed in claim 1 in which said voltage responsive switching means comprises a unijunction transistor.
Claim 32
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 33
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 34
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 35
Dependent Claim
22 words
a transformer coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 36
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 37
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 38
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 39
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 40
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 41
Dependent Claim
23 words
first signaling means coupled to said voltage storage means for generating a termination signal in response to discharge of said voltage storage means;
Claim 42
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 43
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 44
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 45
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 46
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 47
Dependent Claim
61 words
means for connecting said first signaling means to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its first signaling means connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 48
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 49
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 50
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 51
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of said plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 52
Dependent Claim
55 words
A controller for assigning traffic intervals to the conflicting traffic movements at an intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, said controller comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 53
Dependent Claim
55 words
A controller for assigning traffic intervals to the conflicting traffic movements at an intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, said controller comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 54
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of saiD plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 55
Dependent Claim
57 words
means for connecting said transformer to the first switching means first input of an adjacent timing module, whereby each timing module of saiD plurality of timing modules has its transformer connected to an unique one of said timing modules to activate the first switching means of said adjacent timing module upon generation of the termination signal; and
Claim 56
Dependent Claim
67 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 57
Dependent Claim
67 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 58
Dependent Claim
97 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response
Claim 59
Dependent Claim
97 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response
Claim 60
Dependent Claim
68 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 61
Dependent Claim
68 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer.
Claim 62
Dependent Claim
113 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals.
Claim 63
Dependent Claim
113 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals.
Claim 64
Dependent Claim
147 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals; said traffic control system further comprising master control means connected to the power control means control input of each of said controllers for controlling the power applied to each of said first switching means.
Claim 65
Dependent Claim
147 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. second signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals; said traffic control system further comprising master control means connected to the power control means control input of each of said controllers for controlling the power applied to each of said first switching means.
Claim 66
Dependent Claim
112 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals.
Claim 67
Dependent Claim
112 words
means for connecting said first switching means second input to the first switching means output of said adjacent timing module to deactivate said first switching means upon activation of the first switching means of said adjacent timing module; and b. signaling means for applying a starting signal to the first switching means first input of one of said timing modules to initiate operation of said cyclic timer; and II. further switching means coupled to said cyclic timer and adapted for connection to an intersection right-of-way indicator for receiving output signals from said cyclic timer and in response thereto providing excitation for said right-of-way indicator to cause said indicator to indicate traffic intervals.
Claim 68
Dependent Claim
223 words
A controller as claimed in claim 5 in which the first switching means of each timing module includes: a. controlled rectifier means having an input terminal connected to said first switching means power input, an output terminal connected to said first switching means output, and a control terminal connected to said first switching means first input, said controlled rectifier means normally assuming a first state in which current flow from its input terminal to its output terminal is prevented, said controlled rectifier means in response to a signal applied to its control terminal assuming a second state in which current flow is permitted from its input terminal to its output terminal, said controlled rectifier means upon assumption of the second state remaining in the second state so long as current is available to its input terminal; and b. solid-state control means having a first terminal adapted for connection to an electric power source, a second terminal connected to said controlled rectifier means input terminal, and a third terminal connected to said first switching means second input, said solid-state control means in the absence of a signal on its third terminal permitting current flow from its first terminal through its second terminal and in the presence of a signal on its third terminal preventing current flow from its first terminal to its second terminal.
Claim 69
Dependent Claim
18 words
A controller as claimed in claim 5 in which said voltage responsive switching means comprises a unijunction transistor.
Claim 70
Dependent Claim
107 words
A controller as claimed in claim 5 further comprising power control means connected to the power input of the first switching means of each timing module and adapted for connection to a source of voltage, said power control means including a control input and when connected to a source of voltage adapted to assume in the absence of a signal at its control input a first state in which power is provided to each of said first switching means and to assume in the presence of a signal at its control input a second state in which power is blocked from each of said first switching means.
Claim 71
Dependent Claim
100 words
A controller as claimed in claim 8 in which said signaling means comprises additional voltage storage means coupled to said power control means to be charged therefrom, additional voltage responsive switching means coupled to said additional voltage storage means for discharging said additional voltage storage means in response to a predetermined voltage level on said additional voltage storage means, and additional signaling means coupled to said additional voltage storage means and to the first switching means first input of one of said timing modules to apply an initiating signal thereto in response to dIscharge of said additional voltage storage means.
Claim 72
Dependent Claim
51 words
A controller as claimed in claim 8 in which said signaling means comprises a vehicle detector coupled to the first switching means first input of one of said timing modules to apply an initiating signal thereto in response to the detection of a vehicle on a traffic phase not having right-of-way.
Claim 73
Dependent Claim
83 words
A traffic control system for controlling right-of-way on a main roadway at a plurality of intersections comprising a like plurality of controllers, each of said controllers capable of assigning traffic intervals to the conflicting traffic movements at an associated intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, each of said controllers comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 74
Dependent Claim
83 words
A traffic control system for controlling right-of-way on a main roadway at a plurality of intersections comprising a like plurality of controllers, each of said controllers capable of assigning traffic intervals to the conflicting traffic movements at an associated intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, each of said controllers comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 75
Dependent Claim
36 words
A traffic control system as claimed in claim 11 in which said master control means is connected to the additional switching means of each of said controllers for controlling provision of excitation to said right-of-way indicators.
Claim 76
Dependent Claim
14 words
A cyclic timer comprising: a. a plurality of timing modules, each timing module including:
Claim 77
Dependent Claim
14 words
A cyclic timer comprising: a. a plurality of timing modules, each timing module including:
Claim 78
Dependent Claim
55 words
A controller for assigning traffic intervals to the conflicting traffic movements at an intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, said controller comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 79
Dependent Claim
55 words
A controller for assigning traffic intervals to the conflicting traffic movements at an intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, said controller comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 80
Dependent Claim
83 words
A traffic control system for controlling right-of-way on a main roadway at a plurality of intersections comprising a like plurality of controllers, each of said controllers capable of assigning traffic intervals to the conflicting traffic movements at an associated intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, each of said controllers comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
Claim 81
Dependent Claim
83 words
A traffic control system for controlling right-of-way on a main roadway at a plurality of intersections comprising a like plurality of controllers, each of said controllers capable of assigning traffic intervals to the conflicting traffic movements at an associated intersection having N conflicting traffic movements each of which is to be assigned in turn traffic intervals including a right-of-way interval followed by a clearance interval, each of said controllers comprising: I. a cyclic timer including: a. 2N timing modules, each timing module including:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |