US3818846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for liquid disposal in a fluid bed reactor
Assignee: Combustion Power Co Inc
•
Filing: 1972-04-26
•
Granted: 1974-06-25
•
Expires: 1992-04-26
Abstract
Abstract Method and apparatus are disclosed for liquid waste disposal using combustible waste material as a fuel in a fluid bed reactor. One combustion ingredient can be solid waste and one liquid waste ingredient can be sewage sludge. Control of the liquid feed is disclosed to control fluid bed temperature and control of combustible material feed is disclosed to control oxygen-to-combustibles ratio in the combustion chamber. A secondary bed/elutriation arrester may be provided above the principal fluid bed. Particle separators for the combustion gases are provided and air pollution suppressants are added to the bed as required.
Inventors
- 👤 R Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
F; F23; F23J; F23J15/00; B; B01; B01D; B01D45/00; B01D45/12; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/24; B01J8/26; B01J8/28; B03; B03B; B03B9/00; B03B9/06; F23G; F23G5/00; F23G5/008; F23G5/02; F23G5/30; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; F23G2201/00; F23G2201/60; F23G2201/80; F23G2203/00; F23G2203/50; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52
Claims Analysis
Total Claims: 78
Claim 1
Independent Claim
110 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material in said housing, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, an obstruction of labyrinth construction positioned in said housing above said bed, means for introducing waste combustible material into said housing below said obstruction, means for introducing waste liquid other than said combustible material into said housing below said obstruction, and means for controlling combustion coNditions in said housing to consume said waste material.
Claim 2
Dependent Claim
110 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material in said housing, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, an obstruction of labyrinth construction positioned in said housing above said bed, means for introducing waste combustible material into said housing below said obstruction, means for introducing waste liquid other than said combustible material into said housing below said obstruction, and means for controlling combustion coNditions in said housing to consume said waste material.
Claim 3
Dependent Claim
125 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the temperature within said combustion housing, and means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature within said combustion housing at a desired level.
Claim 4
Dependent Claim
125 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the temperature within said combustion housing, and means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature within said combustion housing at a desired level.
Claim 5
Dependent Claim
128 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the content of combustion gases from said combustion housing, and means responsive to said content determining means for feeding said waste combustible material at a rate to maintain the desired balance of oxygen-to-combustibles in said combustion housing.
Claim 6
Dependent Claim
128 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the content of combustion gases from said combustion housing, and means responsive to said content determining means for feeding said waste combustible material at a rate to maintain the desired balance of oxygen-to-combustibles in said combustion housing.
Claim 7
Dependent Claim
161 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the temperature within said combustion housing, means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature within said housing at a desired level, means for determining the content of combustion gases from said housing, and means responsive to said content determining means for feeding said waste combustible material at a rate to maintain the desired balance of oxygen-to-combustibles in said housing.
Claim 8
Dependent Claim
161 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for determining the temperature within said combustion housing, means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature within said housing at a desired level, means for determining the content of combustion gases from said housing, and means responsive to said content determining means for feeding said waste combustible material at a rate to maintain the desired balance of oxygen-to-combustibles in said housing.
Claim 9
Dependent Claim
144 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, and means for pneumatically feeding said waste combustible material into the said combustion housing comprising at least first and second stage blowers to provide air flow and pressure and a velocity reducer waste accumulator located between said blowers to smooth out the flow of combustible waste and to return excess air to the first stagE blower.
Claim 10
Dependent Claim
144 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, and means for pneumatically feeding said waste combustible material into the said combustion housing comprising at least first and second stage blowers to provide air flow and pressure and a velocity reducer waste accumulator located between said blowers to smooth out the flow of combustible waste and to return excess air to the first stagE blower.
Claim 11
Dependent Claim
63 words
The waste disposal apparatus of claim 4 including means for pneumatically feeding said waste combustible material into the said combustion housing comprising at least first and second stage blowers to provide air flow and pressure and a velocity reducer waste accumulator located between said blowers to smooth out the flow of combustible waste and to return excess air to the first stage blower.
Claim 12
Dependent Claim
15 words
The waste disposal apparatus of claim 4 including means for shredding combustible solid waste material.
Claim 13
Dependent Claim
19 words
The waste disposal apparatus of claim 1 including means for separating heavy non-combustible material from the combustible waste material.
Claim 14
Dependent Claim
27 words
The waste disposal apparatus of claim 5 including means for separating heavy non-combustible material from the combustible waste material by air classification at said first stage blower.
Claim 15
Dependent Claim
19 words
The waste disposal apparatus of claim 1 including means for mulching solid chunks of the said combustible waste material.
Claim 16
Dependent Claim
43 words
The waste disposal apparatus of claim 1 including means for drying with combustion exhaust gases said combustible waste prior to injection into the said combustion housing and means for directing water vapor laded hot gases from said drying means to said combustion housing.
Claim 17
Dependent Claim
19 words
The waste disposal apparatus of claim 1 including means for adding pollution suppressant material into the said combustion housing.
Claim 18
Dependent Claim
126 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for adding pollution suppressant material into the said combustion housing, means for determining the amount of constituents of the combustion exhaust gases and means for controlling said pollution suppressant material adding means to maintain acceptable constituent levels.
Claim 19
Dependent Claim
126 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, means for adding pollution suppressant material into the said combustion housing, means for determining the amount of constituents of the combustion exhaust gases and means for controlling said pollution suppressant material adding means to maintain acceptable constituent levels.
Claim 20
Dependent Claim
22 words
The waste disposal apparatus of claim 1 including means attached to said combustion housing for separating particles from the gaseous combustion products.
Claim 21
Dependent Claim
123 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, and means attached to said combustion housing for separating particles from the gaseous combustion products, said particle separating means including a plurality of single stage inertial separators and means for housing and cooling said separators.
Claim 22
Dependent Claim
123 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste material, and means attached to said combustion housing for separating particles from the gaseous combustion products, said particle separating means including a plurality of single stage inertial separators and means for housing and cooling said separators.
Claim 23
Dependent Claim
135 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste Material, means for separating heavy non-combustible material from the combustible waste material, a plurality of single stage inertial separators for separating particles from the gaseous combustion products and means for removing and storing in a closed collection housing particles separated by said inertial separators and said separating means.
Claim 24
Dependent Claim
135 words
A waste disposal apparatus for consuming waste with minimal residue and substantially pollution free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for providing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for introducing waste combustible material into said housing, means for introducing waste liquid other than said combustible material into said housing, means for controlling combustion conditions in said housing to consume said waste Material, means for separating heavy non-combustible material from the combustible waste material, a plurality of single stage inertial separators for separating particles from the gaseous combustion products and means for removing and storing in a closed collection housing particles separated by said inertial separators and said separating means.
Claim 25
Dependent Claim
32 words
The waste material disposal apparatus of claim 1 including turbocharger means connected in communication with and driven by the exhaust gases from said housing and supplying air for operation of the apparatus.
Claim 26
Dependent Claim
20 words
The waste material disposal apparatus of claim 8 including means for separating recyclable material from the said separated non-combustible material.
Claim 27
Dependent Claim
22 words
The waste disposal apparatus of claim 1 wherein said housing includes a plurality of segmented sections joined together at the installation site.
Claim 28
Dependent Claim
22 words
The waste disposal apparatus of claim 1 including air lock feeder valve means for feeding said combustible waste into said combustion housing.
Claim 29
Dependent Claim
28 words
The waste disposal apparatus of claim 1 including screw feed means for feeding said solid waste into said combustion housing by use of a screw type feed device.
Claim 30
Dependent Claim
17 words
The waste disposal apparatus of claim 1 including reverse flow pre-heating means for pre-heating said combustion housing.
Claim 31
Dependent Claim
34 words
The waste disposal apparatus of claim 1 wherein the said means for supporting said granular material includes a plurality of plates made of porous material incased with and supported by structure of other material.
Claim 32
Dependent Claim
34 words
The waste disposal apparatus of claim 1 wherein the said means for supporting said granular material includes a plurality of nozzles at least in part made of porous material and means supporting said nozzles.
Claim 33
Dependent Claim
21 words
The waste disposal apparatus of claim 1 including a secondary bed of particles positioned in said combustion housing above said bed.
Claim 34
Dependent Claim
27 words
The waste disposal apparatus of claim 25 including means for returning to the first bed, particles of said first bed which are carried to said secondary bed.
Claim 35
Dependent Claim
15 words
The waste disposal apparatus of claim 25 including means for internally cooling said secondary bed.
Claim 36
Dependent Claim
37 words
The waste disposal apparatus of claim 25 wherein said secondary bed includes a pair of spaced apart perforated plates and between said plates a multitude of particles larger in size than the particles of the first bed.
Claim 37
Dependent Claim
26 words
The waste disposal apparatus of claim 28 wherein said plates are positioned in said combustion housing at a slight angle with respect to a horizontal plane.
Claim 38
Dependent Claim
22 words
The waste disposal apparatus of claim 1 including means of determining and maintaining the depth of said bed to a desired level.
Claim 39
Dependent Claim
20 words
The waste disposal apparatus of claim 30 including means for automatic removal and closed storage of portions of said bed.
Claim 40
Dependent Claim
197 words
A waste material disposal apparatus where water is used as a coolant to control disposal by combustion of solid, combustible waste with minimum residue and substantially pollution-free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for introducing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for preparing and introducing solid, combustible materials into said bed, means for preparing and introducing waste liquid into the said combustion housing, means for controlling combustion conditions in said combustion housing to consume said waste material including; means for determining the temperature within the combustion housing, means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature in said housing at a desired level, means for determining the content of combustion gases from said combustion housing, means responsive to said content determination means for feeding said solid combustion material at a rate to mAintain the desired balance of oxygen-to-combustibles in said combustion housing, and means for removing, collecting and storing residue remaining from said waste material after combustion in said combustor housing.
Claim 41
Dependent Claim
197 words
A waste material disposal apparatus where water is used as a coolant to control disposal by combustion of solid, combustible waste with minimum residue and substantially pollution-free gaseous output including: a combustion housing, a bed of granular material, means for supporting said bed of granular material, means for introducing combustion air to the bottom of said bed for maintaining said granular material in a fluidized state, means for preparing and introducing solid, combustible materials into said bed, means for preparing and introducing waste liquid into the said combustion housing, means for controlling combustion conditions in said combustion housing to consume said waste material including; means for determining the temperature within the combustion housing, means responsive to said temperature determining means for feeding said liquid waste at a rate to maintain the temperature in said housing at a desired level, means for determining the content of combustion gases from said combustion housing, means responsive to said content determination means for feeding said solid combustion material at a rate to mAintain the desired balance of oxygen-to-combustibles in said combustion housing, and means for removing, collecting and storing residue remaining from said waste material after combustion in said combustor housing.
Claim 42
Dependent Claim
63 words
The waste disposal apparatus of claim 32 including means for pneumatically feeding said waste combustible material into the said combustion housing comprising at least first and second stage blowers to provide air flow and pressure and a velocity reducer waste accumulator located between said blowers to smooth out the flow of combustible waste and to return excess air to the first stage blower.
Claim 43
Dependent Claim
15 words
The waste disposal apparatus of claim 32 including means for shredding combustible solid waste material.
Claim 44
Dependent Claim
19 words
The waste disposal apparatus of claim 32 including means for separating heavy non-combustible material fron the combustible waste material.
Claim 45
Dependent Claim
27 words
The waste disposal apparatus of claim 33 including means for separating heavy non-combustible material from the combustible waste material by air classification at said first stage blower.
Claim 46
Dependent Claim
19 words
The waste disposal apparatus of claim 32 including means for mulching solid chunks of the said combustible waste material.
Claim 47
Dependent Claim
43 words
The waste disposal apparatus of claim 32 including means for drying with combustion exhaust gases said combustible waste prior to injection into the said combustion housing and means for directing water vapor laden hot gases from said drying means to said combustion housing.
Claim 48
Dependent Claim
19 words
The waste disposal apparatus of claim 32 including means for adding pollution suppressant material into the said combustion housing.
Claim 49
Dependent Claim
35 words
The waste disposal apparatus of claim 39 including means for determining the amount of constituents of the combustion exhaust gases and means for controlling said pollution suppressant material adding means to maintain acceptable constituent levels.
Claim 50
Dependent Claim
22 words
The waste disposal apparatus of claim 32 including means attached to said combustion housing for separating particles from the gaseous combustion products.
Claim 51
Dependent Claim
28 words
The waste disposal apparatus of claim 41 wherein said particle separating means includes a plurality of single stage inertial separators and means for housing and cooling said separators.
Claim 52
Dependent Claim
44 words
The waste disposal apparatus of claim 35 including a plurality of single stage inertial separator for separating particles from the gaseous combustion products and means for removing and storing in a closed collection housing particles separated by said inertial separators and said separating means.
Claim 53
Dependent Claim
32 words
The waste material disposal apparatus of claim 32 including turbocharger means connected in communication with and driven by the exhaust gases from said housing and supplying air for operation of the apparatus.
Claim 54
Dependent Claim
20 words
The waste material disposal apparatus of claim 35 including means for separating recyclable material from the said separated non-combustible material.
Claim 55
Dependent Claim
22 words
The waste disposal apparatus of claim 32 wherein said housing includes a plurality of segmented sections joined together at the installation site.
Claim 56
Dependent Claim
22 words
The waste disposal apparatus of claim 32 including air lock feeder valve means for feeding said combustible waste into said combustion housing.
Claim 57
Dependent Claim
28 words
The waste disposal apparatus of claim 32 including screw feed means for feeding said solid waste into said combustion housing by use of a screw type feed device.
Claim 58
Dependent Claim
17 words
The waste disposal apparatus of claim 32 including reverse flow pre-heating means for pre-heating said combustion housing.
Claim 59
Dependent Claim
34 words
The waste disposal apparatus of claim 32 wherein the said means for supporting said granular material includes a plurality of plates made of porous material incased with and supported by structure of other material.
Claim 60
Dependent Claim
34 words
The waste disposal apparatus of claim 32 wherein the said means for supporting said granular material includes a plurality of nozzles at least in part made of porous material and means supporting said nozzles.
Claim 61
Dependent Claim
21 words
The waste disposal apparatus of claim 32 including a seconDary bed of particles positioned in said combustion housing above said bed.
Claim 62
Dependent Claim
27 words
The waste disposal apparatus of claim 52 including means for returning to the first bed, particles of said first bed which are carried to said secondary bed.
Claim 63
Dependent Claim
15 words
The waste disposal apparatus of claim 52 including means for internally cooling said secondary bed.
Claim 64
Dependent Claim
37 words
The waste disposal apparatus of claim 52 wherein said secondary bed includes a pair of spaced apart perforated plates and between said plates a multitude of particles larger in size than the particles of the first bed.
Claim 65
Dependent Claim
26 words
The waste disposal apparatus of claim 55 wherein said plates are positioned in said combustion housing at a slight angle with respect to a horizontal plane.
Claim 66
Dependent Claim
43 words
The waste disposal apparatus of claim 32 including means of determining and maintaining the depth of said bed to a desired level. 58. The waste disposal apparatus of claim 57 including means for automatic removal and closed storage of portions of said bed.
Claim 67
Dependent Claim
78 words
In a fluid bed reactor assembly wherein a bed of granular materials is fluidized to react with other material introduced therein, the improvement comprising: a housing, a first bed of granular material, means for supporting said bed of granular material in said housing, means for providing a fluidized medium to the bottom of said bed for maintaining said granular material in a fluidized state, and an obstruction of labyrinth construction positioned in said housing above said first bed.
Claim 68
Dependent Claim
78 words
In a fluid bed reactor assembly wherein a bed of granular materials is fluidized to react with other material introduced therein, the improvement comprising: a housing, a first bed of granular material, means for supporting said bed of granular material in said housing, means for providing a fluidized medium to the bottom of said bed for maintaining said granular material in a fluidized state, and an obstruction of labyrinth construction positioned in said housing above said first bed.
Claim 69
Dependent Claim
15 words
The apparatus in accordance with claim 59 including means for internally cooling said labyrinth obstruction.
Claim 70
Dependent Claim
38 words
The apparatus in accordance with claim 59 wherein said labyrinth obstruction includes a pair of spaced apart perforated plates, and a multitude of particles positioned between said plates larger in size than the particles of said first bed.
Claim 71
Dependent Claim
24 words
The apparatus of claim 61 wherein said plates are positioned in said combustion housing at a slight angle with respect to a horizontal plane.
Claim 72
Dependent Claim
25 words
The apparatus of claim 59 including means for returning to said first bed particles of said first bed which are carried through said labyrinth obstruction
Claim 73
Independent Claim
88 words
The method of waste disposal comprising fluidizing a bed of granular material having heat storing and heat radiating capability with combustion air for combustion of waste material, simultaneously introducing solid waste and liquid waste into said fluidized bed, for combustion therein, automatically controlling the rate of introduction of said liquid waste into said bed to maintain the combustion temperature within a desired range, and automatically controlling the introduction of said solid waste into said bed to maintain the relation of oxygen-to-combustibles in the bed within a desired range.
Claim 74
Independent Claim
88 words
The method of waste disposal comprising fluidizing a bed of granular material having heat storing and heat radiating capability with combustion air for combustion of waste material, simultaneously introducing solid waste and liquid waste into said fluidized bed, for combustion therein, automatically controlling the rate of introduction of said liquid waste into said bed to maintain the combustion temperature within a desired range, and automatically controlling the introduction of said solid waste into said bed to maintain the relation of oxygen-to-combustibles in the bed within a desired range.
Claim 75
Dependent Claim
26 words
The method of claim 64 including adding air pollution suppressents to said bed to maintain constituent levels in the combustion exhaust gases within a desired range.
Claim 76
Dependent Claim
30 words
The method of claim 64 including collecting separate from atmosphere non-combustibles from the solid waste before introduction into the fluid bed and particulate matter separated from the combustion exhaust gases.
Claim 77
Dependent Claim
32 words
The method of claim 64 including passing the combustion gases from the fluidized bed through a second bed of granular materials larger in size than the particles in the first fluidized bed.
Claim 78
Dependent Claim
24 words
The apparatus of claim 1 including means for removing, collecting and storing residue remaining from said waste material after combustion in said combustion housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |